THE UNKNOWN FACTS-4
THE UNKNOWN FACTS-4 1. Each eye of a dragonfly has about 30,000 lenses. 2. In the US, one third of all adults complain about sleep problems. (I think not only in the US.) 3. The channel catfish has 100,000 taste buds on the outside of its body. 4. The venom of the black widow spider is called "latrotoxin." This toxin causes a massive release of acetylcholine from neuromuscular junctions. 5. The X-ray was invented by Wilhelm Konrad Roentgen in 1895. 6. A giraffe sleeps only two hours each day. 7. The human eyeball is 24.5 mm (~ 1 in) long. 8. The adult human spinal cord weighs about 35 grams (0.1 lb) ...