Produce what is this the full question?
<span>Their wings are better at swimming - 'and no bird can excel at both' The reason why penguins cannot fly has finally been laid to rest, researchers claim. Penguins cannot fly because they are such good swimmers - and no bird can excel at both.</span>
Crusades, many European who went to Jerusalem to fight for the holy land would end up bringing home goods like spices and fabric. This would open up Europe to all new types of foods, materials and ideas about medicine and science.
