Inspired by Amy Poehler’s character on “Parks and Recreation,” Feb. 13 is all about celebrating female friendships.

Forget dinner and chocolates. Do something for your sweetie that's fun and doesn't cost a thing.

Your canine companion shows affection in many ways. You just have to know what to look for. Here's how your dog says I love you.

Check out these sweet gifts for the love of your life, be it of the four-legged or two-legged variety.

The Bronx Zoo will let you name one of its Madagascar hissing cockroaches after anyone you like — or don't like.

Marine Mammal Program trains and employs sea lions and other animals for military duty.

There are some strange places around the world where objects appear to roll uphill against gravity.

This impressive feat of design in Chongqing, China connects eight roads, and somehow is still easy for drivers to navigate.

As the Florida Keys cleans up and dries out after Hurricane Irma, take a moment to recognize this 113-mile-long feat of American ingenuity.

Tesla unveils the Tesla Semi, an electric semi truck, and surprises everyone with an update to the Roadster at the same live event.

Right-of-way farming now joins solar car charging and pollinator-friendly landscaping along the Ray C. Anderson Memorial Highway in Troup County.

As a growing number of homeless people take to Los Angeles' subway system, officials consider installing mobile showers and bathrooms at certain stations.

The Tappan Zee Bridge over the Hudson River will at long last sleep with the fishes, thanks to the largest expansion of artificial reefs in N.Y. history.

The fabled highway's inclusion on the National Trust for Historic Preservation's annual most endangered list might come as a surprise .

Crab-like creatures or camera lens covers? NASA and other experts weigh in.

Why is Venus rotating 6.5 minutes slower than it was just 16 years ago?

The ESA hopes to fly a spacecraft close to Phobos, orbit the lower Venusian atmosphere and draw up a map of Mars' hydrous areas in 2013.

It won't exactly make Venus any more desirable as a tourist destination.

Burger King released an eye-opening anti-bullying ad by seeing how their own customers responded to bullied kids vs. a bullied burger.

Antwon Lee tells his little man "it's OK to cry" and to "stay strong" during the ordeal.

A new study has found structural brain differences that may account for callous-unemotional traits in boys.

'What Were You Thinking?' is a podcast series that showcases real-life stories of adolescents who made life-altering choices.

New products like the KnoNap may help keep women and men safe while they are drinking and socializing.

For many children, realism isn't really the objective, so we should probably stop looking for that in their art.

When we're hungry, our brains get more excited about high-calorie foods.

American Academy of Pediatrics warns heat from dishwasher can cause toxins to leach into food.

All of the oat-based cereals tested by EWG had traces of what the World Health Organization has named a "probable carcinogen."

The doctor who discovered the dangers of concussions says kids should avoid high-impact sports until they are 18.

A new book shows us how our faces reveal our true selves.

Sex. Many (but not all) animals do it.

Thanks in part to shows like 'Modern Family,' a majority of Americans are now in favor of same-sex marriage.

New research concludes that hypersexuality is not a neurological or physiological disorder, but just heightened libido.

Videos and ads by Roxy for women's surfing gear and swimsuits anger female surfers.

Even water tastes sweeter when you're in love, new research finds.

Most middle-aged women do not give up sex as they age, especially if sex is important to them.

Men have lost most of the genes originally included on the Y chromosome during evolution, but those genes essential for survival have persevered.

"Sex in the Wild" is an entertaining, educational, explicit and scientifically stimulating look at how animals reproduce.

A new survey links a fondness for grilled cheese with how often you make love. (Seriously.)

Women's cheeks get redder when they are the most fertile, but this color change is so subtle that it is undetectable by the human eye.

Men now outnumber women in some Scandinavian countries, and scientists are reeling to explain why.

A binary star system that got too close to our resident supermassive black hole paid the ultimate price.

Through November, customers can redeem specially marked bottles of Finlandia vodka to donate a tree planting in honor of themselves, friends or family through T

Drone video shows the beautiful fall foliage on display in Vermont.

Video: Larry Schweiger, president and chief executive Officer of the National Wildlife Federation, talks with Rachel Maddow about the extent of damage to Gulf c

Former oilman T. Boone Pickens talks about the need to get off foreign oil and the recent spill in the Gulf Coast.

Nature photographer Florian Schulz says the oil spill in the Gulf must serve as a warning as the U.S. seeks oil in the Arctic.

Louisiana Gov. Jindal puts up Flickr album of gruesome oil creeping into Louisiana wetlands.

Why are government officials still blocking journalists from documenting the Gulf oil spill? What are they hiding, and why is Obama letting it happen?

Alaskan journalist Charles Wohlforth, author of 'The Fate of Nature,' tells MSNBC about the oil spill's likely long-term effects and what could exacerbate them.

The makers of eco-docu 'FUEL' wants you to attend two big events to help end America's addiction to fossil fuels.