Catching the stars
Roger Angel is one of the world's most brilliant and audacious engineers. Could he design the next energy revolution?
If human history turns on the tilt of the multiverse, can we still trust our ideas of achievement, progress and morality?
I contradict myself
I am an atheist and a Quaker. Does it matter what I believe, when I recognise that religion is something I need?
History and guilt
Can America face up to the terrible reality of slavery in the way that Germany has faced up to the Holocaust?
How can scientists act ethically when they are studying the victims of a human tragedy, such as the Romanian orphans?
The wait of the world
Ditching the leap second would mean decoupling clock time from the Earth’s rotation – from day and night itself
The real two cultures
I am a geneticist, my sister works a dairy farm. Our lives are so different we might as well be living in parallel worlds
Our genes and our culture tell us to live as long as possible – even when living is misery. Should we listen?
Magic or medicine?
If you were a poor Ugandan mother with a desperately ill baby, would you turn to Western medicine or the village healer?