Rob Riggle. Image Credit: DiscoveryUK Actor, comedian and retired Marine Rob Riggle is travelling to locations connected to some of history’s most persistent mysteries, working with archaeologists, historians and other specialists to examine the evidence behind them. His investigations cover subjects ranging from the Holy Grail and Atlantis to the disappearance of Rome’s 9th Legion…

Researchers have found that waste eggshells can be processed into a fine powder and used to replace part of the cement in mortar without reducing its compressive strength. A study tested calcined eggshell powder at replacement levels ranging from 2.5% to 12.5%. The strongest result came at 10%, where the mortar reached a compressive strength…