The balloon’s string, still attached to a radio transmitter, had gouged into the bird’s flesh—fracturing bones, killing tissues and cutting off circulation to the bird’s feet. The ...

When helium filled balloons are handed out at public events, they usually come with a piece of string or ribbon attached. The attachment is either tied into the knot, or secured with a plastic disk.

To Conduct Demonstration Show six balloons in octahedral arrangement. Pull tightly on the slack end of the string to enhance the shape. Pop one balloons. Show how the five now conform to trigonal ...

Bring the candle under the helium balloon until the tip of the flame touches the balloon. Be prepared for an explosion. Do not light the string on fire! Repeat with the hydrogen balloon. The explosion ...