https://www.oxford-royale.co.uk/articles/5-great-discoveries.html
https://www.theguardian.com/science/2013/sep/01/20-big-questions-in-science
https://www.popsci.com/what-came-before-big-bang#page-2
http://www.iflscience.com/technology/are-humans-really-on-the-brink-of-achieving-immortality/
https://www.scientificamerican.com/article/how-did-life-begin-on-earth/
https://www.webmd.com/sleep-disorders/guide/dreaming-overview#1
http://www.who.int/mediacentre/factsheets/fs297/en/
https://www.medicalnewstoday.com/articles/321106.php
http://time.com/alien-life/
https://www.psychologytoday.com/us/blog/the-superhuman-mind/201303/what-is-consciousness
https://spaceplace.nasa.gov/review/dr-marc-space/time-travel.html
https://www.theguardian.com/news/2017/oct/06/why-cant-we-cure-the-common-cold
https://en.wikipedia.org/wiki/Black_hole
http://www.skyandtelescope.com/astronomy-resources/whats-inside-a-black-hole/