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A 3D illustration of the now debunked competing conspiracy theory that the Earth is flat, as it appears from land, rather than spherical. Earth texture maps courtesy of NASA.gov; Shutterstock ID 1240127368; purchase_order: -; job: -; client: -; other:

What would the horizon look like on a disc-shaped planet? part 3

Two readers argue that we’ve overlooked some key information about disc-shaped planets

Twisteddoodles on a helpful new drug-delivery system

Tom Gauld proposes a standard model of Easter egg structure

High five from a cute scruffy dog with a big smile! Cream wall background, shallow depth of field. Clever dog, the Bailey lightbox

This week’s new questions

pecan nut; Shutterstock ID 356646077; purchase_order: -; job: -; client: -; other:

What is the advantage to walnuts and pecans of their convoluted form?

Close-up of adorable young seal swimming in clear blue water and looking at camera, near Brighton, Sussex, United Kingdom

Why do seals have such cute faces?

nose

When we breathe, why does the dominant nasal passage swap sides?

EH7TAT Clock faces, illustration

Can a person experience more than 24 hours in a day? Part 3

Tigerite Rock, Australia

Environment

Stunning photographs show the dynamic patterns of the natural world

Comment

Is this the most niche scientific tourist attraction in the world?

Feedback is delighted by the discovery of a very specific scientific sculpture park in China – and wonders if readers can top it

Environment

Stark photos show quest for profit cutting swathes through the Amazon

This week’s new questions

Why don’t orcas attack humans? part 3

Tom Gauld on robot dreams