A big twisted tree rising into a sky full of ominous clouds.

Considering how much the Government of India has missed anticipating – the rise of a second wave of COVID-19 infections, the crippling medical oxygen shortage, the circulation of new variants of concern – I have been wondering about why we assemble giant institutions like governments: among other things, they are to weather uncertainty as best […]

An artist's impression of two neutron stars colliding in a kilonova explosion, releasing gravitational waves. ESO/L. Calçada/M. Kornmesser

Yesterday, I learnt the answer is ‘yes’. Gravitational waves can be gravitationally lensed. It seems obvious once you think about it, but not something that strikes you (assuming you’re not a physicist) right away. When physicists solve problems relating to the spacetime continuum, they imagine it as a four-dimensional manifold: three of space and one […]