The Canadian dollar (symbol : $ ; code: CAD) is the currency of Canada. It is abbreviated with the dollar sign $ , or sometimes C$ to distinguish it from other dollar-denominated currencies. It is divided into 100 cents.
Mystery of how sperm whales hold their breath for 90 minutes solved as scientists discover the key is unique protein in their blood.
Stig Severinsen has written a book called Breatheology which helps people find their 'inner dolphin' - a state of mind to help control breathing underwater. He also holds the record for the longest underwater swim, travelling 500ft (152m 40cm) in just two minutes and 11 seconds.