With a heatwave expected this weekend, the Danbury Fire Marshal's Office is reminding drivers to Look Before You Lock.  They're concerned about children or dogs being left alone inside vehicles.  In 10 minutes a car’s temperature can rise over 20 degrees, and over 50 degrees in an hour, even on a mild day.  The Fire Marshal says cracking the windows offers little to no relief.  A child’s body can heat up 5 times faster than an adults.  Drivers are encouraged to place a cellphone, purse or wallet in the back seat as a reminder to check it before leaving.  If someone else is driving your child, the Fire Marshal suggests checking with them to make sure they arrived safely at their destination.