This week’s questions

Why do we feel sleepy at night even if we have slept for a whole day?

Pratishta Dashora, Udaipur, Rajasthan

How are spacecraft like Mars Orbiter instantly controlled from Earth, crores of kilometers away? How do the images captured by the orbiter’s camera reach the Earth in a short time?

Antony J., Thiruvananthapuram

Why are humans advised not to breath from the mouth?

Chandhini M.K., Chennai