(WASHINGTON) -- Senate Majority Leader Mitch McConnell, from the tobacco state of Kentucky, on Monday unveiled federal legislation to raise the minimum age to purchase e-cigarettes and all other...

Simas Kucinskas writes: I would like to share some recent research (pdf here). In this paper, I develop a new method for estimating R in real time, and apply it to track the dynamics of COVID-19. The method is based on standard epidemiological theory, but the approach itself is heavily inspired by time-series statistics. I […]

Carlos Ungil writes: The IHME released an update to their model yesterday. Using now a better model and taking into account the relaxation of mitigation measures their forecast for US deaths has almost doubled to 134k (95% uncertainty range 95k-243k). My [Ungil’s] charts of the evolution of forecasts across time can be found here. I […]

Part 1 Andrew Lilley, Gianluca Rinaldi, and Matthew Lilley write: You might be familiar with a recent paper by Correira, Luck, and Verner who argued that cities that enacted non-pharmaceutical interventions earlier / for longer during the Spanish Flu of 1918 had higher subsequent economic growth. The paper has had extensive media coverage – e.g. […]

As heads of state, local leaders, business owners and individual citizens weighed the costs of re-opening the global economy, fears of new outbreaks grew. A central question emerged: How much infection and loss of life will emerge amid the push to restart business?

Each year in the spring (April – June), an increase in the turbidity of drinking (potable) water occurs at Grand Canyon National Park. Turbidity has no health effects.  https://www.nps.gov/grca/learn/news/info-2009-04-01-turbid.htm

Grand Canyon National Park Superintendent Steve Martin has announced that an Environmental Assessment (EA) for Supai Camp Improvements is now available for public review and comment. https://www.nps.gov/grca/learn/news/environmental-assessment-for-improvements-at-supai-camp-within-grand-canyon-national-park-available-for-public-review-and-comment.htm

This year National Public Lands Day at Grand Canyon National Park will be commemorated with more than free admission and volunteer opportunities. Park staff and friends will also be celebrating the park’s first Dia de la Familia. https://www.nps.gov/grca/learn/news/news_2009-09-01_npld-dia.htm

https://www.nps.gov/grca/learn/news/grand-canyon-national-park-to-celebrate-dia-de-la-familia-on-national-public-lands-day.htm

The National Park Service has released an Abandoned Mine Lands (AML) Closure Plan and Environmental Assessment for projects to correct health and safety hazards associated with abandoned mines in four national park system sites in Arizona. https://www.nps.gov/grca/learn/news/2010-02-12_mines_ea.htm

Grand Canyon Announces Public Meeting Schedule for Mule Operations and Stock Use Environmental Assessment https://www.nps.gov/grca/learn/news/national-park-service-announces-public-meetings-to-discuss-mule-operations-and-stock-use-environmental-assessment.htm

Phase II of the improvements called for in the South Rim Visitor Transportation Plan/Environmental Assessment (Transportation Plan) is now substantially complete; and Mather Point and the Visitor Center plaza areas have reopened for public use. https://www.nps.gov/grca/learn/news/2011-01-06_phaseii.htm

https://www.nps.gov/grca/learn/news/news-5may2011.htm

Grand Canyon National Park’s Division of Science and Resource Management will host a public open house on June 8th at Park Headquarters in the courtyard from 10 a.m. to 2 p.m. https://www.nps.gov/grca/learn/news/news25may2011.htm

Grand Canyon National Park’s Division of Science and Resource Management will host a public open house on July 25 in the Grand Canyon Lodge Auditorium on the North Rim from 10 a.m. to 2 p.m. https://www.nps.gov/grca/learn/news/behind-the-scenes-science-and-resource-management-staff-to-host-public-open-house-in-the-grand-canyon-lodge-on-the-north-rim-of-grand-canyon-national-park.htm

Grand Canyon National Park will be joining national park units across the country in celebrating National Public Lands Day with fee free entry into the park. https://www.nps.gov/grca/learn/news/2011-09-14_npld.htm

Beginning Nov. 7, the public will have an opportunity to attend public meetings on the development of a long-term plan that will determine the timing and volume of water flows from Glen Canyon Dam. Those flows affect hydroelectricity production, beach recreation, native fish and other river-related plants and animals, as well as archeological sites in Grand Canyon National Park and Glen Canyon National Recreation Area. https://www.nps.gov/grca/learn/news/public-invited-to-open-houses-on-plan-for-glen-canyon-dam-operations.htm

Sobriety safety checkpoints will be set up within Grand Canyon National Park this holiday season in an effort to assure the safety of park visitors and residents. https://www.nps.gov/grca/learn/news/2011-12-21_checkpoints.htm

On December 28, during the peak of the holiday season, a sobriety safety checkpoint was conducted in Grand Canyon National Park. https://www.nps.gov/grca/learn/news/2012-01-10_checkpoint.htm

Rangers in Grand Canyon National Park are seeking the public’s assistance in locating 47-year old Shaw Joseph Ostermann of Tempe, Arizona. https://www.nps.gov/grca/learn/news/2012-04-17_missing.htm

On Friday, May 18, 2012, Grand Canyon National Park will celebrate Endangered Species Day in recognition of the national conservation effort to protect our nation’s endangered species and their habitats. Then, on Saturday, May 19, the celebration will continue as the park hosts its 5th annual Celebrate Wildlife Day. https://www.nps.gov/grca/learn/news/2012-04-25_cwd-esd.htm

Each year in the spring, Grand Canyon National Park experiences an increase in turbidity in the drinking water. This increased turbidity is caused by snow melt, spring rains recharging the aquifer and increased water flows through the rock formations to Roaring Springs.. https://www.nps.gov/grca/learn/news/2012-04-30_turbidity.htm

Although Grand Canyon National Park received below-average precipitation this winter, the warm spring caused vegetation in the park to thrive. Now, fine fuels are quickly drying out as winds and temperatures rise, increasing the risk of wildfire. https://www.nps.gov/grca/learn/news/2012-05-24_fire.htm

Grand Canyon National Park rangers will be setting up sobriety safety checkpoints, over the Memorial Day weekend, in an effort to assure the safety of park visitors and residents. https://www.nps.gov/grca/learn/news/grand-canyon-national-park-taking-steps-to-ensure-public-safety-over-the-memorial-day-weekend.htm

On Wednesday, September 12, Grand Canyon National Park will celebrate the completion of several new park facilities intended to promote healthy outdoor activity in the park and to increase visitor access to the South Rim by means other than automobile. https://www.nps.gov/grca/learn/news/2012-08-30_ribbon-cutting.htm

Grand Canyon National Park will be joining national park units across the country in celebrating National Public Lands Day (NPLD) with fee free entry into the park. https://www.nps.gov/grca/learn/news/2012-09-17_npld.htm

Grand Canyon to Celebrate Wildlife Day https://www.nps.gov/grca/learn/news/public-invited-to-grand-canyons-celebrate-wildlife-day-events.htm

Grand Canyon National Park will be joining national park units across the country in celebrating National Public Lands Day (NPLD) with fee free entry into the park on Saturday, September 28, 2013. https://www.nps.gov/grca/learn/news/grand-canyon-to-celebrate-national-public-lands-day-with-fee-free-entry-september-28.htm

Grand Canyon Association (GCA), the official nonprofit partner of Grand Canyon National Park, today announced a $1 million donation from Arizona Public Service (APS) that will establish the Grand Canyon Trails Forever Endowment to help preserve and protect Grand Canyon’s trails. This is one of the most significant private, philanthropic gifts in Grand Canyon’s history. https://www.nps.gov/grca/learn/news/grand-canyon-association-receives-one-million-dollars-from-arizona-public-service-to-initiate-the-trails-forever-endowment-at-grand-canyon-national-park.htm

The National Park Service (NPS) is pleased to announce the latest step to manage the impacts of bison on the North Rim of Grand Canyon National Park (GCNP). After meeting with cooperators Arizona Game and Fish Department (AGFD), U.S. Forest Service (USFS) and the Bureau of Land Management (BLM)--over the last several months, the NPS will initiate public scoping later this week for a bison management plan and environmental impact statement (EIS) to be prepared pursuant to the National Environmental Policy Act (NEPA). https://www.nps.gov/grca/learn/news/national-park-service-seeks-public-input-on-a-bison-management-plan-and-environmental-impact-statement-for-grand-canyon-national-park.htm

Grand Canyon National Park (GCNP) will hold two informational, online meetings as part of the scoping process for a bison management plan and environmental impact statement. https://www.nps.gov/grca/learn/news/public-scoping-webinars-planned-for-grand-canyon-national-park-bison-management-plan-eis.htm

Although Grand Canyon National Park received below-average precipitation this winter, the warm spring caused vegetation in the park to thrive. Now, fine fuels are quickly drying out as winds and temperatures rise, increasing the risk of wildfire. https://www.nps.gov/grca/learn/news/memorial-day-fire-aware.htm

On Saturday, September 13, 2014, Grand Canyon National Park will dedicate the park as a Globally Important Bird Area as part of its 7th Annual Celebrate Wildlife Day. https://www.nps.gov/grca/learn/news/september-2014-wildlife-day.htm

Grand Canyon National Park invites the public to celebrate the 50th Anniversary of the Wilderness Act on September 25th and National Public Lands Day on the September 27, 2014. https://www.nps.gov/grca/learn/news/wilderness-npld-day.htm

Coconino County Public Health Services District and Grand Canyon National Park will begin monthly monitoring for plague. https://www.nps.gov/grca/learn/news/grand-canyon-and-coconino-county-to-monitor-for-plague.htm

Celebrate National Public Lands Day on Saturday, September 26, with free entrance to Grand Canyon and all national park units across the country. https://www.nps.gov/grca/learn/news/fee-free-public-lands-day.htm

Grand Canyon National Park invites the public to start the celebration for the upcoming National Park Service Centennial on Saturday, November 7 and visit the REI Village. https://www.nps.gov/grca/learn/news/rei-village-at-grand-canyon.htm

The National Park Service (NPS) announced today another opportunity for the public to weigh in on revisions to Grand Canyon National Park’s Backcountry Management Plan (BMP). https://www.nps.gov/grca/learn/news/backcountry-plan-draft-eis.htm

The National Park Service (NPS) announced today another opportunity for the public to weigh in on revisions to Grand Canyon National Park’s Backcountry Management Plan (BMP). The NPS began developing a Draft Environmental Impact Statement (DEIS) for this plan in 2011 in compliance with the National Environmental Policy Act (NEPA). https://www.nps.gov/grca/learn/news/backcountry-plan-webinar-and-open-house.htm

The National Park Service announced a 30-day extension of the public comment period for Grand Canyon National Park’s Backcountry Management Plan and Draft Environmental Impact Statement . https://www.nps.gov/grca/learn/news/backcountry-deis-comment-extension.htm

The National Park Service (NPS) has announced a 30-day public comment period seeking input on changes to the scope of the Bison Management Plan at Grand Canyon National Park. https://www.nps.gov/grca/learn/news/grand-canyon-bison-ea.htm

Celebrate National Public Lands Day with free entrance to Grand Canyon National Park Saturday, September 24. https://www.nps.gov/grca/learn/news/national-public-lands-day.htm

The National Park Service (NPS) has announced that the Initial Bison Herd Reduction Environmental Assessment (EA), which evaluates management actions related to bison on Grand Canyon’s North Rim, is available for public review and comment. https://www.nps.gov/grca/learn/news/bison-ea.htm

The NPS has announced that it will extend the public comment period on the Initial Bison Herd Reduction Environmental Assessment (EA). The EA will now be available for public review and comment through June 14, 2017. https://www.nps.gov/grca/learn/news/initial-bison-herd-ea.htm

The National Park Service (NPS) is seeking public comment on a proposal to replace the obsolete Trans-Canyon Water Distribution Pipeline (Pipeline). The analysis of the project to replace the Pipeline and development of alternatives through an environmental assessment (EA) is required under the National Environmental Policy Act (NEPA). https://www.nps.gov/grca/learn/news/2017-07-05-pipeline-public-comment-sought.htm

VERMILION CLIFFS, Ariz. – California Condors will be released to the wild in the Vermilion Cliffs National Monument in northern Arizona at 11 a.m. Saturday, Sept. 30. The public is welcome to observe the release from a viewing area where spotting scopes will be set up and project personnel will be available to answer questions. https://www.nps.gov/grca/learn/news/public-invited-to-release-of-california-condors.htm

Grand Canyon National Park will join national park sites around the country in celebrating National Public Lands Day with free entrance to the park. Entrance fees will be waived for all visitors arriving to Grand Canyon National Park on Saturday, September 30, 2017. https://www.nps.gov/grca/learn/news/fee-free-national-public-lands-day.htm

The National Park Service (NPS) is seeking public input on an Expanded Non-native Aquatic Species Management Plan and Environmental Assessment (EA) in Grand Canyon National Park (GCNP) and Glen Canyon National Recreation Area (GCNRA) below the Glen Canyon Dam. Public scoping will be held for a 30-day period from November 15 to December 14. https://www.nps.gov/grca/learn/news/nps-public-scoping.htm

The National Park Service (NPS) is seeking public comment on a proposal to modify facilities at Desert View to create an Inter-tribal Cultural Heritage Site. The NPS is preparing an environmental assessment (EA), in accordance with the National Environmental Policy Act, to develop and evaluate alternatives. https://www.nps.gov/grca/learn/news/desert-view-public-input.htm

In place of the park's nightly evening program, visitors can learn about characters from Grand Canyon's past as they come to life and share their stories about life on the rim. Opening night is Friday, June 29 at 8:30 pm at McKee Amphitheater with additional presentations on Friday, July 27; Saturday, July 28; and Sunday July 29. https://www.nps.gov/grca/learn/news/echoes-from-the-canyon-2018.htm