Useless thing that you've learnt?

1: Spiders and Scorpions are NOT deadly venomous at all, the "deadliest" spider in the world (Australian Redback) has not caused a single fatality in about 50 years and even before antivenom rarely caused deaths in elderly people with preexisting heart complications.

2: there is only 1 snake in the whole world with venom specialized to kill warm blooded mammals (inland Taipan)

3: the Human eye is peerless in resolving details on object at super long ranges.

4: humans are lonely at the top in long distance running of all animals. 

5: it's possible for water to go below 0° celsius without crystalizing.

6: Apple rips off customers with scummy repair scams.

7: Dragon Trees can be propagated with stem cuttings

8: there are three types of UV light (A B and C) with different wavelengths, 2 of those can damage cells and cause cancer. but 1 does not.

9: a grown tree costs thousands in property value.

10: political loads ruined conventional television.