Photovoltaic solar cells are thin silicon disks that convert sunlight into electricity. These disks act as energy sources for a wide variety of uses. Read more: http://www.madehow.com/Volume-1/Solar-Cell.html#ixzz2r6ZkiKVL
Wafering iron | Italy, made 1481. These irons were used to make wafers or waffles, which were eaten at weddings, baptisms and on the Sunday before Lent (the period of fasting before Easter). The inscription suggests that this one was made for a wedding.