The acorn is the nut of the oak tree and its close relatives, in the family Fagaceae. Acorns usually contain a seedling surrounded by two cotyledons (seedling leaves), enclosed in a tough shell known as the pericarp, and borne in a cup-shaped cupule. This acorn of the species Quercus robur (the pedunculate oak), with a length of 25 millimetres (1 inch), was photographed in Keila, Estonia.Photograph credit: Ivar Leidus
Replica of the bomb that pierced the Mosta Dome in Malta without exploding during World War II while it was full of people waiting for the evening mass to begin.