Does a large meal make you tired, and if so, why?
It's sometimes called a "food coma", says one reader, along with explanations of how a big meal really can make you drowsy
Regulars
This week鈥檚 new questions
How long before all human traces are wiped out?
What is the carbon payback period for a wind turbine?
Regulars
How can a tree reabsorb its own branch?
Regulars
This week鈥檚 new questions
Regulars
How does water hydrate us?
Regulars
Why do dogs and horses roll on their backs when happy?
Regulars
This week鈥檚 new questions
Regulars
Far-sighted: How can some people see at great distance?
One reader wanted to know how a safari guide could spot wildlife at a distance that he could barely see with binoculars. Other readers respond
Regulars
This week’s new questions
Regulars
Sneeze blindness: Why do your eyes close when you sneeze?
Beef with tofu: is local beef better for the planet than tofu imports?
Regulars
Clean limbs: the debate continues on whether you should wash your legs
Regulars