Robyn Arianrhod

A book connecting Artificial Intelligence with storytelling around a Stone Age campfire certainly piqued my interest, especially given the stratospheric success of its author’s earlier works. Indeed, historian Yuval Noah Harari’s Sapiens (2011) was so successful that in 2019 he and his husband, Itzik Yahav, cofounded ‘Sapienship’, an initiative advocating on global challenges through focused conversations and global responsibility. In this spirit, Harari’s latest book, Nexus, focuses on the AI revolution. His Homo Deus (2015) also tackled this theme, but here Harari recapitulates ideas from both these earlier books and then develops them using an innovative framework that reviews history in terms of the impact of information networks. It is the relaying of information, says Harari, that connects Stone Age storytellers and AI.

If you ever came across a vector in a high-school science class, it probably looked quite simple: a little arrow you might draw on a diagram to show the motion of a train or the forces on a swinging pendulum. An arrow pointing right would cancel an arrow pointing left, or → + ← = 0. Add together two arrows pointing in the same direction, you get one twice as long: →. A rightward arrow plus an upward one? You’ve got yourself a diagonal: → + ↑ =  ↗.

Let’s face it, quantum mechanics mystifies most of us. But as Quantum Drama shows, it baffled its creators, too – so much so that some of them turned to suicide, drink, or psychiatry (Carl Jung was a favourite). Who wouldn’t go crazy, trying to get their head around such bizarre happenings as subatomic particles sometimes being wave-like, and a theory that cannot tell you the particle’s definite state – its position and velocity, say – before you measure it? In ordinary ‘classical’ physics, by contrast, you can predict in advance every point on the trajectory of an ordinary object, such as a ball or a spacecraft, launched from any given place with any particular velocity. But quantum theory does not play by these long-established rules: until you observe the particle, all the theory can tell you are the chances it will show up at various places. As Einstein asked, ‘Do you really believe the Moon is only there when you look at it?’

During a recent lunar eclipse, I marvelled as Earth’s shadow nibbled away the Moon’s light. This creeping shadow testified to the awesome movement of the celestial spheres, Earth inching along its trajectory around the Sun while the Moon fell around Earth until, on this special night, all three bodies were closely aligned in the same plane: Sun, Earth, Moon. A related alignment occurs each month, when the Sun’s light is reflected from the full, uninterrupted Moon. We can see it because the Moon orbits Earth in a slightly different plane from that of Earth’s motion around the Sun. But on this night, the Moon was passing through a point where these two planes intersected, so that Earth directly blocked the light from Sun to Moon.

The Best Australian Science Writing (BASW) anthology is here again, and readers are in for a treat: a wide-ranging selection of easy-to-read articles describing some of the amazing science that is happening right now.

Of course, it is an impossible task, choosing the ‘best’ writing, and in her introduction editor Donna Lu acknowledges her subjectivity. It is the same for a reviewer, and since I don’t have room to name everyone, I won’t single out my own favourites.