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Are Expired Foods Still Safe to Eat?
science.howstuffworks.com/innovation/edible-innovations/expired-foods-safe-eat.htm
Surprisingly, the date stamped on your unopened can of tuna doesn't really have much to do with how safe it is to eat. So what does it mean, and how can you decide whether to eat it or chuck it?
Are Humans Apes? Tracing Our Evolutionary Path
science.howstuffworks.com/life/evolution/man-chimp-ape.htm
Are humans separate from chimps and other apes? Learn what separates us from chimps.
Are Pentagon-confirmed UFOs a National Security Threat?
science.howstuffworks.com/space/aliens-ufos/ufos-news.htm
Recently, there's been a spike in UFO sightings - officially UAP, or Unidentified Aerial Phenomena - all over the world and nobody seems to know why or what the objects we're seeing might be.
Are Plastic-eating Enzymes Our Planet's Only Hope?
science.howstuffworks.com/environmental/green-science/plastic-eating-enzyme-planets-new-hope.htm
Two bacterial enzymes degrade PET plastics and could potentially be a solution to Earth's massive waste problem. HowStuffWorks looks at the science.
Are Polar Bears Endangered?
science.howstuffworks.com/environmental/green-science/polar-bear-global-warming.htm
Polar bears and global warming are getting attention from conservationists and the general public. See why polar bears are threatened by global warming.
Are There Diamonds in the Ocean?
science.howstuffworks.com/environmental/ocean-diamonds.htm
Not all diamonds are found on dry land. Many turn up in sediments below the ocean's surface. You just have to know where to look.
Are There Tornadoes in Europe?
science.howstuffworks.com/nature/natural-disasters/do-tornadoes-only-occur-in-north-america.htm
North America certainly has many claims to fame. It's got the Great Lakes, the Grand Canyon and Niagara Falls -- all pretty impressive stuff. But can it claim tornadoes as uniquely its own -- and if so, what's up with that?
Are UFOs Real? Close Encounters of the First, Second and Third Kinds
science.howstuffworks.com/space/aliens-ufos/ufo-classification.htm
UFO siting classification Classification has six categories: nocturnal lights, daylight discs, radar/visual cases, and close encounters. Read more about UFO classification.
Are Unicorns Real? Proof, Theories and Lore
Would they be a mating display? A fierce weapon to defend against lions?
Are We Entering the Sixth Major Extinction on Earth?
science.howstuffworks.com/life/evolution/sixth-major-extinction.htm
A new global report says 1 million species are at risk of extinction - the greatest number in human history.