A Look That Says "I would run if I were you."
This cool cat is one of the four Siberian tigers that call the Philadelphia Zoo home.
Siberian tigers, also known as Amur tigers, are the world's biggest cats, capable of growing 12 feet long and weighing upwards of 300 kg (660 lb). Their keen and stunningly deep eyes see six times better than humans' do. Thick coats and an insulating layer of fat allow them to sustain temperatures as low as -42 degrees Celsius (-45 in Fahrenheit). Add all those up and you've got quite the predator on your hands. Sadly, the Siberian tiger is highly endangered. It is estimated that only about 350 remain in the wild.
Learn more about Siberian tigers:
-at the World Wildlife Fund
-at WCS Russia
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Here are 7 often-overlooked World Heritage Sites, each with its own history.
- UNESCO World Heritage Sites are locations of high value to humanity, either for their cultural, historical, or natural significance.
- Some are even designated as World Heritage Sites because humans don't go there at all, while others have felt the effects of too much human influence.
- These 7 UNESCO World Heritage Sites each represent an overlooked or at-risk facet of humanity's collective cultural heritage.
Famous physicists like Richard Feynman think 137 holds the answers to the Universe.
- The fine structure constant has mystified scientists since the 1800s.
- The number 1/137 might hold the clues to the Grand Unified Theory.
- Relativity, electromagnetism and quantum mechanics are unified by the number.
A new method promises to capture an elusive dark world particle.
- Scientists working on the Large Hadron Collider (LHC) devised a method for trapping dark matter particles.
- Dark matter is estimated to take up 26.8% of all matter in the Universe.
- The researchers will be able to try their approach in 2021, when the LHC goes back online.
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