Attaching shark teeth to saw blades shows why they are shaped differently

A study sought to understand why shark teeth are shaped differently and what biological advantages various shapes have by testing their performance under realistic conditions. The researchers from the University of Washington attached different shark teeth to a saw and attempted to cut through a hunk of salmon at the same speed a shark would devour its prey. Sep 9, 2016

Hajj: Why Saudi Arabia is stepping up security for this years pilgrimage

Disaster struck in September 2015 as two groups of pilgrims collided at a crossroads of two a narrow streets killing at least 2,426 people. There are various factors that affected the stampede including: pilgrims rushing to complete the time-sensitive rituals, heat and exhaustion, masses of people pushing in opposite directions, and confusion of first-timers. This hasnt been the only incident; hundreds of other pilgrims have been killed during the same ceremony in years past but 2015’s disaster was the deadliest at Mina since 1990 when 1,426 people died. This year Saudi Arabia have to step up security after Iran called its organisers incompetent. Iran, Saudi Arabia’s regional rival, blamed the disaster on organisers’ incompetence straining international relations. Sep 7, 2016

Afghanistan: Pamlarena siege ends in Kabul after suicide bombers kill 24

Three Taliban gunmen and one civilian have been killed Kabul in a 12 hour police siege marking the end of a day of carnage in which 24 more people were killed and more than 90 wounded in twin suicide attacks outside the Afghan Ministry of Defence. The siege followed three blasts in the capital in 24 hours, two have been claimed by the Taliban. Sep 6, 2016