A visitor looks at a kinetic-energy battery charging device during the "Made in Canada" exhibition held at Science World in Vancouver, Canada, May 16, 2017. The "Made in Canada" exhibition is a science invention exhibition that allows the visitors to learn about some famous and not-so-famous, but super neat Canadian inventions in 19th and 20th centuries, and also showcases the country's latest innovations to public. (Xinhua/Liang Sen)
