Evolutionary biology/psychology

[Crafty_Dog]

https://bigthink.com/design-for-good/eggs-may-get-to-decide-which-sperm-to-fertilize-them?utm_medium=Social&utm_source=Facebook&fbclid=IwAR2RQBg1CxeBRozxtxvZ5iMXV3rk-FML8U2Fvjk8JcJiA2ZrJNApPkTYKPI#Echobox=1555624783

[Crafty_Dog]

http://nautil.us/blog/the-problem-with-the-way-scientists-study-reason?fbclid=IwAR0I4_cnBrzARrCapxdsOvQlnwX4wPmFKMbcJ7LguWB4QTILidC6t3ezeOg

[Crafty_Dog]

https://primatology.net/2008/04/29/orangutan-photographed-using-tool-as-spear-to-fish/?fbclid=IwAR10ehQkesWaV9v5cioMkYbYMMLvNy4JNWDNoyo9RXuTD3fQzAHbvQY-54k

[Crafty_Dog]

https://www.youtube.com/watch?v=noj4phMT9OE

[Crafty_Dog]

https://www.intellectualtakeout.org/blog/study-men-are-getting-weaker?fbclid=IwAR1MKa4bxolkyouXTGcdkthGkDadTdR4fqlAlAt08_cmn3O1TEjrzwV9NEg