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This week’s new questions

What shape would a candle flame be in zero gravity? Plus: It is often stated that the human brain is the most complex object in the universe, but is it more complex than, say, Earth’s biosphere?

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CNW7E8 ph value of a sample of the soil ist tested with litmus paper, Germany

Humans

How to analyse your garden soil and choose the plants to suit it

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Humans

Benjamin Franklin’s quest to make farts less malodorous

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Tom Gauld on the adventures of Science Knight

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Twisteddoodles: It’s on fire

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All the tablets cancer patient Ann-Marie takes in a month. I have been collecting a month of empty packaging, and have taken photos from arrival to making into dossett boxes some 50 tablets a day, making 1500 a month

Health

Radiotherapy masks to hellebore root: see the ways we confront cancer

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Image of the broken fragments surrounding Fragment B of Comet 73P/Schwassmann-Wachmann 3 observed with FORS1 on ESO's VLT in four filters (B, V, R, and I). As the telescope was tracking the comet, the stars appear as coloured trails, indicating the order in which the comet was observed in the different filters. North is up and East is to the left.

Space

Watch out for comet SW3, which might cause a meteor shower in late May

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2AD2YRB Pile of pink pills and around a white one. Medication, self-treatment or placebo concept: one tablet is different from the lot of others

What is it that provides the healing effect of a placebo treatment?

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F3EPBC Birds, Black Chinned Hummingbird sucking nector from Anise Sage flower, Idaho, USA

Do birds ever get out of breath?

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What is the weird mussel-like thing found in a mine?

Readers may have found the answer to the mystery of the odd, rusty bivalve-like form found in a Welsh pit

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This week’s new questions

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Up-to-the-minute advice on the benefits of testicle tanning

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Tom Gauld stared into the abyss, and now they meet for regular chats

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Twisteddoodles: I’m you, but from a different dimension

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