https://www.pippasworld.com/Weird Questions. Real Science. Big Laughs.en-ushttps://www.pippasworld.com/weird-nature/why-do-cats-purr/https://www.pippasworld.com/weird-nature/why-do-cats-purr/Sun, 01 Nov 2026 08:28:04 GMTWhy do cats purr? See how the larynx makes a 25 to 30 Hz sound, why purring can mean more than contentment, which big cats purr, and what healing claims lack.https://www.pippasworld.com/weird-nature/immortal-jellyfish/https://www.pippasworld.com/weird-nature/immortal-jellyfish/Sun, 01 Nov 2026 08:28:04 GMTIs the immortal jellyfish really immortal? Learn how Turritopsis dohrnii turns back into a polyp, and why it can still be eaten or die of disease.https://www.pippasworld.com/what-if/what-if-the-moon-disappeared/https://www.pippasworld.com/what-if/what-if-the-moon-disappeared/Sun, 01 Nov 2026 08:28:04 GMTWhat if the moon disappeared? Tides shrink to the Sun's share and nights go dark at once, while tilt and day length change over millions of years.https://www.pippasworld.com/what-if/what-if-the-earth-stopped-spinning/https://www.pippasworld.com/what-if/what-if-the-earth-stopped-spinning/Sun, 01 Nov 2026 08:28:04 GMTWhat if the Earth stopped spinning? A sudden stop vs a very slow one: 1,040 mph at the equator, oceans at the poles and a day and night lasting a year.https://www.pippasworld.com/everyday-science/aluminum-foil-in-microwave/https://www.pippasworld.com/everyday-science/aluminum-foil-in-microwave/Sun, 01 Nov 2026 07:20:33 GMTUsually no. Learn why foil sparks at sharp edges, what the FDA and USDA actually say, and the only situations where a small, smooth piece may be okay.https://www.pippasworld.com/everyday-science/why-onions-make-you-cry/https://www.pippasworld.com/everyday-science/why-onions-make-you-cry/Sun, 01 Nov 2026 07:20:33 GMTWhy do onions make you cry? Learn how cutting creates an eye-irritating sulfur gas, what the eye does next, and which onion tips have real evidence.https://www.pippasworld.com/everyday-science/are-bananas-radioactive/https://www.pippasworld.com/everyday-science/are-bananas-radioactive/Sun, 01 Nov 2026 07:20:33 GMTYes, slightly. Learn what potassium-40 is, where the 0.1 microsievert banana dose comes from, and why it is an imperfect yardstick for everyday radiation.https://www.pippasworld.com/everyday-science/how-much-water-does-ai-use/https://www.pippasworld.com/everyday-science/how-much-water-does-ai-use/Sun, 01 Nov 2026 07:20:33 GMTPublished per-prompt figures run from 0.26 mL to 519 mL. See why they differ, where the bottle claim came from, and what direct and indirect water mean.https://www.pippasworld.com/everyday-science/how-much-energy-does-chatgpt-use/https://www.pippasworld.com/everyday-science/how-much-energy-does-chatgpt-use/Sun, 01 Nov 2026 07:20:33 GMTEstimates for one ChatGPT prompt range from about 0.3 Wh to over 30 Wh. See what changes the number, how estimates fell, and the household math.https://www.pippasworld.com/everyday-science/why-does-ice-float/https://www.pippasworld.com/everyday-science/why-does-ice-float/Sun, 01 Nov 2026 07:20:33 GMTWhy does ice float? Hydrogen bonds lock water into an open crystal that is about 8% less dense than liquid. See the numbers and what it means for lakes.https://www.pippasworld.com/human-body/why-do-we-get-goosebumps/https://www.pippasworld.com/human-body/why-do-we-get-goosebumps/Sun, 01 Nov 2026 07:20:33 GMTWhy do we get goosebumps? Tiny muscles pull on hairs when nerves fire. Learn why cold, fear and music trigger them, and what mouse research found.