In a survey on humanity’s most vital inventions, the British public ranked the flush toilet above mobile phones, beds, shoes, and the combustion engine. Who can blame them? In a well-sewered world, we are protected from many of the infectious diseases that contributed to making our unplumbed ancestors’ lives nasty, brutish, and short. Cholera, hepatitis, polio, and the diarrhoeal diseases that continue to kill more people globally than acts of violence all implicate faecal transmission. It seems only rational to dispatch our excrement as quickly as possible in a cleansing torrent of water.

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?’

An anthology dedicated to the transnational history of psychedelic drugs and culture seems a timely enterprise. We are twenty or so years into what has become known as the ‘psychedelic renaissance’, the global revival of interest in compounds such as LSD, mescaline, and psilocybin centring on their use alongside psychotherapy as treatments for a growing number of mental health disorders.

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 photograph arrives while I am reading Dave Witty’s What the Trees See. A tree’s branch close-up, outer brown-red bark peeled back to smooth and brilliant green. A friend, spotting it on Quandamooka Country in Minjerribah, North Stradbroke Island, has been understandably stopped in her tracks. Framed intimately like this, its shape and textures suggest warm musculature: lean in, you will be held. This beautiful creature.