Fond memories of travelling over the Pontcysyllte aqueduct on our canal boat holiday this summer. Looking down from the boat is not for the faint hearted!

Here's my rapidly improvised colander technique this morning. It's a bit hazy but still a nice effect.

Great to see @helenczerski.bsky.social and @jimalkhalili.bsky.social at Science Live lectures today. I'll have lots of questions to field when I see my students on Monday!