Elon Musk, Michio Kaku, Ray Kurzweil, Stephen Hawking, and so many others are advising that rapid changes in technology will change the way people work, travel, reproduce, and think in the future. Is it all happening too fast? Even these bright minds, who are on the cutting edge of science, advise caution.

Elon Musk feels there are five categories of technology that will impact the future of mankind. The “last two,” Elon Musk says in his video below, have a “potential to be a double-edged sword.”

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Henry Greely, director of the Center for Law and the Biosciences, is quoted in Scientific American.

“In 20 to 40 years we’ll be able to derive eggs and sperm from stem cells, probably the parents’ skin cells. This will allow easy preimplantation genetic diagnosis on a large number of embryos—or easy genome modification for those who want edited embryos instead of just selected ones.”