How many chickens do you weigh? How tall are you in apples or inches or pennies?  Can you use your foot as a ruler?  The answers to these and other questions can be explored at Measurement Rules, an interactive exhibit at ECHO, January 16 thru May 9, 2021. It might be common to measure using standard tools such as measuring tapes and vessels – but the Measurement exhibit will explore some nonstandard ones such as balancing scales, odometers, calipers, 3-D imaging and counting “Mississippis.” Included with admission fee. ECHO is open Friday to Monday and Wednesday with 2 time slots: 10 am-12:30 pm and 1:30-4 pm; closed for cleaning 12:30-1 pm. Click here to purchase online tickets.