A striking 2015 satellite image has captured a rare meteorological phenomenon known as von Kármán vortices swirling off ...

For solving parameter uncertainties and external interference sensitivity of quadrotor aircraft, quadrotor attitude control under an active disturbance rejection control (ADRC) scheme based on ...

Study reports persistent visual disturbances in men taking the highest recommended dose of sildenafil, suggesting that first-time users should use a lower dose. Image: Shutterstock -- by Conn Hastings ...