Recently, archeologists of Leiden University made an excavation in Oegstgeest, where they found a unique silver bowl from the first half of the seventh century as well as imported pottery and winebarrels. Thijs Porck, lecturer in Old English language and culture at Leiden University, places the Oegstgeest finds in a literary-historical context. "It wouldn't surprise me if the Leiden archaeologists soon encountered a pair of oversized bones."
The very oldest Koranic fragments owned by the Leiden University Libraries date back to the second half of the seventh century, between 30 and 70 years after the death of the Prophet Muhammad. This has been shown by newly conducted radiocarbon analyses. This finding agrees with official Islamic teachings.
Frogs evaluate different streams of information to assess how they should react to rivals. This is what Leiden biologist Wouter Halfwerk has discovered. He has published an article about it in the journal Current Biology