This magazine is private.
• Since 1760, productivity has increased almost 30 fold.• That is largely down to technological innovations like electricity, telephones, and the internet.• Barclays chronicled the world's rising productivity
Physicist and best-selling author Stephen Hawking presents a program in Seattle in 2012. Note his (outdated) assertion that a singularity, and the Big Bang, precedes the epoch of cosmic inflation, which
Brian Greene, professor of physics and mathematics at Columbia University and co-founder of the World Science Festival, explains what we know about time travel so far. Following is a transcript of the