It may be the fact that, every second

A rare rhinoceros under constant protection, an albino orangutan, and protected pandas are among this week’s pick of images from the natural world

Beyond the “merely healthy” individual, he suggested, were those who became better human beings for others as well as for themselves. And a key factor in this transition, he suggested, was what he called “peak experience”. By this he meant “rare, exciting, oceanic, deeply moving, exhilarating, elevating experiences that generate an advanced form of perceiving reality”.

What we wonder at changes according to circumstances, age and culture. It may be something as apparently banal as the sounds from a rainstick. It may be the fact that, every second, billions of neutrinos (subatomic particles) from the sun are streaming through your body at almost the speed of light, and do so even at night when the sun is on the other side of the Earth and the neutrinos are passing straight through the Earth first.