You can buy all kinds of conventional clocks that have hands and numbers for easy reading. Or, like [Fabio Ricci], you could build yourself something a little more esoteric, like this neat shadow ...

Atop the tallest pyramid at the site of San Isidro in western El Salvador, archaeologists have unearthed five ceramic figurines dating to around 400 b.c. Each figurine has an evocative facial ...