EnvironmentForests became less diverse when ancient people started herding pigs Ancient DNA extracted from layers of sediment in a Czech forest shows how a drop in biodiversity coincided with a shift to pig herding about 4000 years ago 51¶¯Âþ
HumansIron Age skeletons found under bridge may have been hit by a tsunami Twenty people may have died 2000 years ago when an Iron Age bridge suddenly collapsed following a tsunami or flood, but scientists also cannot rule out that they were sacrificed 51¶¯Âþ