Count the squares in the matchstick puzzle below?

What's a single-digit number with no value?

What can go up a chimney down, but can’t go down a chimney up?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

What goes up but never comes down?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

How many times in a given day, minutes and hour clock comes in a straight line ?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

I have branches, but no fruit, trunk or leaves. What am I?

Can you identify if it's a murder or a suicide ?