Key points from article :
Scientists declare they will not develop robots that can attack people without human oversight.
Co-founder of Google DeepMind and CEO of SpaceX among the 2,400 signatories.
Highlights dangers of handing over life and death decisions to AI-enhanced machines.
Future of Life Institute organised pledge calls for laws and regulations.
"A human must always be in the loop” - Toby Walsh, professor of AI.