More surprising facts

• Training a dog is easier if you use rewards they enjoy, like sniffing or playing, instead of just forcing them to obey.
• Earth and Venus are nearly identical in size but have vastly different temperatures due to carbon in their atmospheres.
• A meringue is made of the same basic materials as human bone.
• Drones can act as first responders, arriving at emergency scenes in seconds to provide vital information to authorities.