There are a few weird things going on with each subsequent generation of humans (at least in the last few centuries or so). For one, scientists have been baffled by what appears to be a never-ending increase in human height. Another such factor is that it seems that as each generation comes and goes, the next one that comes along has a few points higher IQ.
According to an article released in the Huffington Post, due to the increased standard of living (like medical care, education, and job opportunities), each new generation of humans is having a slightly higher IQ. A study followed 751 people, who were divided into 2 groups. One group was born in 1921, and the other in 1936. Eventually, the study found a 3.7 IQ point lead in the group that was born in 1936.