A comet in the night sky
A university student watches an online lecture
Mekong river bordering Thailand and Laos
Vaccination programs are in full swing.
Ancient mammoth tooth
People ice skate on a canal in Amsterdam, Netherlands
Many states are experiencing extreme weather.
A single Boeing 777 engine
People wait for a bus in Delhi
Charvi Goyal, 17, prepares to jump online for a tutoring session