麻豆传媒

Last Word

Brachiosaurus dinosaur in water next to islands with palm trees. This is a 3d render illustration; Shutterstock ID 2218581533; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

When I invent a time machine, what is the earliest time period in Earth鈥檚 history to which I can return and comfortably survive? And is there exactly the same number of electrons as there are protons in the universe? Is that also true of the Earth at any given moment?

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2CXYTWB Close up of a green cicada insect bug on a plant

What triggers cicadas to make noises in unison, then go silent?

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2JAN5P2 Holland Street meets the steep Albion Hill in the Hanover neighbourhood of Brighton

Do people in hilly towns have better health than those in flat towns?

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Golden lion tamarin; Shutterstock ID 121264012; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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K4E74X The Earth from space. This image elements furnished by NASA.

If Earth stopped rotating, would this affect the force of gravity?

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purebred beagle puppy is learning the world in first time; Shutterstock ID 566398009; purchase_order: -; job: -; client: -; other: -

Why do we say 鈥渁ww鈥� when we see small, fluffy things?

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Kudzu ( Pueraria lobata ) flowers. Fabbaceae perennial vine. Dark blue-purple fragrant butterfly-shaped flowers bloom in racemes from July to September. The roots are edible and medicinal.; Shutterstock ID 2360739029; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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In this Voyager 2 image of Saturn, obtained Aug. 11, 1981, from a range of 14.7 million kilometers (9.1 million miles), north is at the upper right edge of the disc. Seen above the planet are the satellites Dione (right) and Enceladus. This false-color print shows a green spot at the south edge of a yellow band; in true color, the spot would appear brown and the band white. A bright yellow spot slightly above and to the left in this image moves eastward relative to the green spot at a rate that allows it to pass the green feature in about 50 days. The convective clouds that appear between the two spots are typical of the region. Here, the smallest visible structures measure about 270 kilometers (170 miles). The Voyager project is managed for NASA by the Jet Propulsion Laboratory, Pasadena, Calif. https://www.jpl.nasa.gov/images/pia01959-voyager-2-image-of-saturn

What is the probability that Voyager 1 or 2 will hit a planet or star?

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Yellow wash scrub sponge placed on wet blue background covered with drops of water in light room during household chores; Shutterstock ID 2167323189; purchase_order: -; job: -; client: -; other: -

Why does a slightly damp sponge absorb water better than a dry one?

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2F4D4YW Two American crows sitting on a bare branch communicating with each other.

This week鈥檚 new questions

How do crows develop such distinct and individual 鈥渧oices鈥�? One reader notes that they don鈥檛 hear the same variety in other bird species in their garden. And why do older people seem to experience time passing more quickly?

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Which bicycle lights are safest and give the best visibility?

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How can popped knuckles be so exceptionally loud?

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What is the shortest space a parked car can get out of? Part 2

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This week鈥檚 new questions

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