Science

Science 6 min Fossil From Fujian Suggests Some of the Earliest Birds Had Already Given Up Flying A crow-sized Late Jurassic bird with a raptor's sickle claw and short forelimbs was probably a ground-dwelling... NA Nadia Rahim 20 Oct Science 6 min Bolt torque and clamp load across the published nut factors A tightening torque becomes clamp load through a nut factor, K, that stands in for thread and head friction. O... KE Kenji Tanaka 19 Oct Science 6 min Hazen-Williams C values and how far the published tables disagree Hazen-Williams estimates friction loss in a water pipe from one roughness number, C, and published tables give... NA Nadia Rahim 19 Oct Science 6 min Nearly 27% of the World's Land May Already Be Conserved, Well Above the Official 18.5%, Nature Study Estimates A sample of 25 countries finds protected areas missing from global records, putting the 30 by 30 land goal wit... NA Nadia Rahim 19 Oct Science 6 min Horsepower, PS and kilowatts, and where the torque and power curves cross Car power is printed in mechanical horsepower, metric horsepower (PS) or kilowatts, three units that differ by... KE Kenji Tanaka 18 Oct Science 6 min The clock rule taught for crosswind reads high, most of all at sixty degrees The crosswind on a runway is the wind speed times the sine of the angle between wind and runway, and flight tr... KE Kenji Tanaka 16 Oct Science 6 min Warm water shifts a pipe's Reynolds number more than the laminar limits differ Physics texts put the end of laminar pipe flow at a Reynolds number of 2,000 or 2,300, depending on the source... KE Kenji Tanaka 15 Oct Science 6 min Jet lag by direction, worked through on routes out of Singapore and Hong Kong Flying east asks the body clock to run earlier and flying west asks it to run later, and early estimates from... KE Kenji Tanaka 15 Oct Home & Living 6 min Dog pregnancy length and why counting from mating widens the due date A dog's pregnancy averages about 63 days counted from ovulation, but how wide the window is depends on which e... AM Amelia Wong 15 Oct Science 6 min Rebar weight by the d²/162 rule runs a fraction heavy against the standards Rebar mass per metre is usually worked out as the bar's diameter in millimetres, squared, divided by 162. We c... KE Kenji Tanaka 15 Oct Science 5 min Bleached Corals Recovered in Seven Weeks After Touching a Healthy Twin A Stanford lab study found fused tissue lets algae flow from a healthy coral into a bleached clone. It only wo... NA Nadia Rahim 15 Oct Science 6 min An X chromosome comes from fewer ancestors than a family tree allows A man's X chromosome can come only from his mother's side, while a woman's comes from both parents, so the anc... NA Nadia Rahim 15 Oct Science 6 min Shortcut WBGT formulas land on both sides of Singapore's measured heat stress Singapore's official heat stress readings blend three thermometers, one of them in the sun. Checked against 30... KE Kenji Tanaka 15 Oct Science 4 min X-Ray Lasers Catch the Enzyme That Makes Penicillin Midway Through Its Work An Oxford-led team filmed IPNS building the antibiotic's core rings and found a sulphur atom that lets go of i... NA Nadia Rahim 14 Oct Science 6 min Humidity adds close to 400 feet to density altitude at Changi Water vapour is lighter than dry air, so humid air raises density altitude even at a sea-level airport. At Cha... KE Kenji Tanaka 14 Oct Science 4 min Medieval Teeth Show Children in England's Peak District Were Heavily Exposed to Lead From the 600s Enamel from 17 burials dates the revival of the region's lead industry to the mid-seventh century, and hints t... NA Nadia Rahim 14 Oct Science 6 min Homebrew ABV formulas part ways once original gravity reaches 1.070 Homebrewers turn original and final gravity readings into alcohol by volume with one of two formulas, which ag... NA Nadia Rahim 12 Oct Science 6 min The same wind speed can mean twice the pressure, depending on its averaging time Wind pressure follows the square of the speed, so whether a figure is a 3-second gust or a 10-minute mean can... KE Kenji Tanaka 12 Oct Science 6 min Thunder covers a kilometre in under three seconds in Singapore air Dividing the seconds between a lightning flash and its thunder by three gives kilometres, but in Singapore's a... KE Kenji Tanaka 8 Oct Science 6 min Rare blood-group variants allow most of the child blood types a chart forbids The textbook ABO rule forbids at least one child blood type for every pairing of parent types except A with B.... NA Nadia Rahim 8 Oct Health & Wellness 6 min QT correction formulas agree at 60 beats a minute and drift apart either side Bazett, Fridericia and Framingham correct the QT interval to a heart rate of 60 beats a minute, where all thre... PR Priya Nair 8 Oct Science 4 min Animals Probably Arose 800 to 700 Million Years Ago, Long Before Their Oldest Fossils Scientists have long disagreed over when the first animals appeared. A new study argues that a key fossil site... NA Nadia Rahim 7 Oct Science 4 min People Bend the Facts to Suit Their Choices, and the Selfish Version Spreads Faster In nine experiments with 8,769 adults, those who kept more for themselves played down the cost to others. When... NA Nadia Rahim 3 Oct Science 7 min Nature Says Academies Named Researchers Without Consent and Offered Others Paid Memberships A Nature investigation links several grand-sounding societies to shared virtual mailboxes and one recurring na... NA Nadia Rahim 29 Sep