![](https://i.kinja-img.com/gawker-media/image/upload/s--Knv5EE8O--/c_fit,fl_progressive,q_80,w_636/mjbphkiucrftgtk8oc8u.jpg)
Scientists have long wondered why humans often give without accepting anything in return, or why we tend to help unrelated strangers. Apparently, what others think means a lot to us as a species and that has contributed to the size of our big brains.
No comments:
Post a Comment