References:

10. Why do birds have beaks?

https://gridclub.com/subscribers/info/fact_gadget_2009/1001/nature/evolution/186.html

http://projectbeak.org/adaptations/beaks_sipping.htm

http://www.whyzz.com/why-do-birds-have-beaks

9. Who or what caused the theory of aliens?

http://norse-mythology.net/the-nine-worlds-in-norse-mythology/

https://en.wikipedia.org/wiki/Cosmic_pluralism

https://esoterx.com/2015/07/14/our-ancient-multiverse-the-cosmic-pluralism-of-anaximander-leucippus-democritus-and-epicurus/

http://www.germanicmythology.com/original/9WorldsAttempts.html

8. Who was the first deaf person in history?

http://libguides.gallaudet.edu/content.php?pid=352126&sid=2881782

https://treepony.com/deaf-history-was-quintus-pedius-the-painter-really-the-first-deaf-person-mentioned-in-ancient-literature/

7. Where and why does lightning strike?

https://www.nationalgeographic.com/environment/natural-disasters/lightning/

http://www.nssl.noaa.gov/education/svrwx101/lightning/faq/


6. If a planet had three Suns, would it be three times hotter?

https://www.livescience.com/33500-earth-two-suns-tatooine.html

https://en.wikipedia.org/wiki/Kepler-16b

https://www.space.com/22509-binary-stars.html

5. What is the oldest language still used today?

http://www.k-international.com/blog/oldest-living-languages/

https://theculturetrip.com/asia/india/articles/the-10-oldest-languages-still-spoken-in-the-world-today/

4. Is it possible for humans to become extinct instantly?

https://www.astrobio.net/news-exclusive/deadly-nearby-gamma-ray-burst/

https://astronomynow.com/2017/07/27/gamma-ray-burst-captured-in-unprecedented-detail/

3. If the Earth was split in half, would the two halves form back together?

https://worldbuilding.stackexchange.com/questions/18432/what-if-the-earth-was-physically-split-in-half

https://www.quora.com/What-would-happen-if-earth-suddenly-split-in-half-and-stayed-separate-for-the-rest-of-its-life-Ignore-how-it-happens-and-how-it-stays-separate

2. Can you cry without eyes?

https://www.reddit.com/r/NoStupidQuestions/comments/2xufv8/can_people_with_no_eyes_still_cry_how_does_that/

https://www.quora.com/What-happens-with-regard-to-the-ability-to-cry-when-ones-tear-ducts-are-damaged-or-gone

1. Why do our eyes change color and is it possible to have red eyes?

http://www.allaboutvision.com/conditions/eye-color.htm

https://owlcation.com/stem/Rarest-Eye-Color-in-Humans