Using math to design amazing mirrors

Mathematician Andrew Hicks was in his Drexel University office, puzzling over some problem he can no longer recall, when colleague Ron Perline walked in with a challenge. Fresh from his morning bicycle ride, Perline was unhappy ...

Modeling a right royal butterfly effect

The monarch butterfly, Danaus plexippus, is renowned for its striking appearance and perhaps even more than that, its remarkable long-distance migration. The population present in North America heads south each year in the ...

A novel technique for creating superhydrophobic surfaces

Superhydrophobic surfaces, characterized by their ability to repel water with a contact angle above 150° and a sliding angle below 10°, offer a range of applications from self-cleaning and anti-corrosion to oil/water separation ...

OSIRIS-REx adjusts course to target sample capsule's landing zone

On Sept. 10, NASA's OSIRIS-REx spacecraft briefly fired its ACS (attitude control system) thrusters to point itself toward Earth, putting it on course to release its sample capsule, carrying rocks and dust from asteroid Bennu, ...

Can twin boundaries resist fatigue cracking?

Grain boundaries are widely distributed in metallic crystals and have important impacts on their mechanical properties. Among them, high-angle grain boundaries (HAGBs) can strengthen metallic materials, but the stress concentration ...

Science uncovers the secret to superb shots in soccer

Soccer, also known as football, is the most popular sport in 57 countries, and its players are among the most highly paid athletes in the world; therefore, every shot is valuable. Knowing how to adjust foot orientation and ...

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