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Your heart beats over 100,000 times every day
Wombats produce cube-shaped poop
Tarsiers have eyes larger than their brains
Your lungs contain nearly 1,500 miles of airways
Aye-ayes tap on wood and listen for insect larvae inside
Humans spend about one-third of life asleep
Your feet have about a quarter of all the bones in your body
Split attention between two conversations is surprisingly poor
A day on Mars lasts about 24 hours and 39 minutes
Stick insects are masters of camouflage — and some can regenerate limbs
The cosmic microwave background is ~2.7 K
Water is densest at about 4°C
Europa likely hides a global ocean under its ice
A year on Neptune lasts about 165 Earth years
The Chandrasekhar limit is about 1.4 solar masses
A lightning bolt carries about 1 billion joules of energy
The observable universe is about 93 billion light-years across
Photosynthesis converts ~100 billion tons of carbon per year
Quantum entanglement links particles across distance
Humans and bananas share about 60% of their genes
Your brain generates enough electricity to power a small LED
Low Earth orbit needs about 7.8 km/s of speed
A teaspoon of a neutron star would weigh about 6 billion tons
Reindeer eyes change color with the seasons
A rainbow’s arc is always about 42° from the anti-solar point
Electric eels can generate over 600 volts
Fungi make up an estimated 90% of soil living mass in forests
Yangtze finless porpoises are the only freshwater porpoise left
The cosmic microwave background is leftover light from the Big Bang
Naked mole-rats are nearly cold-blooded among mammals and highly resistant to cancer
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