Which will be the biggest engineering challenge of the 21st century?

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news features opinion fiction reviews gadgets media room Free sample! Read a complete digital edition of COSMOS now. View sample	Unscientific poll Which will be the biggest engineering challenge of the 21st century? Solar power for all 42% Reverse engineering the brain 36% Virtual reality 5% Commercial spaceflight 17%	COSMOS newsletter! Sign up to the COSMOS newsletter Enter your email address Receive regular updates highlighting the latest in science from COSMOS. Latest News Explosion of binary star captured Mammoth genome cracked: key to cloning? Coral growth rings point to bad weather ahead Laser creates billions of antimatter particles Stem cells rebuild patient's windpipe more

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