Notice: Use of undefined constant REQUEST_URI - assumed 'REQUEST_URI' in /home/ropstam/public_html/oneclickvideos/wp-content/themes/Divi/functions.php on line 73
Cutting a Klein Bottle in Half – Numberphile | One Click Videos

Klein Bottle enthusiast Cliff Stoll uses a diamond saw on a glass Klein Bottle. More videos about his bottles: http://bit.ly/KleinBottles Cliff’s site (selling bottles): …