女生小视频

Four cheerful female friends having fun on summer road trip

This week鈥檚 new questions

When driving in summer, to cool my car, is it a more efficient use of energy to use air conditioning or to open the windows (causing extra drag)? And can ultrasound damage our ears, even though we can鈥檛 hear it?

iss067e189024 (July 16, 2022) --- The sun's rays begin to illuminate the Earth's atmosphere as the International Space Station flew into an orbital sunrise 261 miles above Texas. iss067e189024 NASA ID: iss067e189024 iss067e189024 (July 16, 2022) --- The sun's rays begin to illuminate the Earth's atmosphere as the International Space Station flew into an orbital sunrise 261 miles above Texas. Date Created:2022-07-16 Center:JSC

When was the first sunrise on Earth?

Bengal cat washing itself on bed; Shutterstock ID 1123136123; purchase_order: -; job: -; client: -; other: -

Why do cats wash themselves, while dogs don鈥檛?

MNN37P Illustration comparing the planets of the Solar System and the Sun on the same scale. The planets are shown to scale relative to each other but their distances are not. From left to right the bodies are: the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Will the planets of our solar system ever line up in a row? (Part 2)

Big dog meets small dog; Shutterstock ID 2045462630; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

HCNBCF THOR: THE DARK WORLD, Chris Hemsworth as Thor, 2013. ph: Jay Maidment/?Walt Disney Studios/courtesy Everett Collection

Could you make a machine that 鈥渇lew鈥� like Thor鈥檚 hammer in the comics?

This mosaic of Mars is a compilation of images captured by the Viking Orbiter 1. The center of the scene shows the entire Valles Marineris canyon system, more than 2,000 miles (3,000 kilometers) long, 370 miles (600 kilometers) wide and 5 miles (8 kilometers) deep, extending from Noctis Labyrinthus, the arcuate system of graben to the west, to the chaotic terrain to the east.

If humans colonised Mars, how would they calculate time? (Part 2)

HDTNNH Crab-eating macaca in Thailand ; specie Macaca fascicularis family of Cercopithecidae

This week鈥檚 new questions

2AFPK7B Cyclist and Runner on Trail

If a cyclist and runner exercise together, who expends more energy?

Close up to the dictionary definition of Phlegmatic; Shutterstock ID 1188169102; purchase_order: -; job: -; client: -; other: -

Why do I need to be able to pronounce a word to recall it?

Humans evolved to remember sounds, not letters, so this isn鈥檛 surprising, say our readers 鈥� but we can easily remember words for which we have conceived an incorrect pronunciation

Is there a correct way to fill a dishwasher? (continued)

This week鈥檚 new questions

So much in the universe spins. Could the universe itself be spinning?

Do we really know how ancient Romans pronounced Latin words? (Part 2)