The bark of an older redwood tree is fireproof.
65
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Sound travels fifteen times faster through steel than through air.
134
Scientists aren't sure what color dinosaurs were.
312
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79