What has hands, but can’t clap?

Can you solve the below tricky visual equation?

A man was telling some of his war stories to his grandchildren.
"When the World War I was on the verge of end, I was awarded for my bravery for I had saved a group of my men." He coughed and then added, "When we were fighting in northern France, an enemy soldier threw a grenade at us. Before it could explode, I picked it up and threw it away. For my act of bravery, right before the war ended, A General gave me a sword engraved with the words "Awarded for Display of Bravery and Heroism in World War 1"."

Hearing this, one of the grandson spoke up. "Grandpa, this is not a true story. It can"t be true!"

The truth is that it was not. How did the grand children know it?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Count the number of triangles in the below picture?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

What is the largest number you can write with just 3 digits?