Britain has a new big problem: crumbling concrete in schools, hospitals, airports, and theaters

• Some buildings in the UK were made with a type of concrete called RAAC that's now unsafe.
• The "crumbly concrete" was used in hundreds of schools and some have been shut over fears of collapses.
• The crisis has ignited a new debate about the government's past spending cuts.

More than 100 schools in the UK have been closed because the type of concrete used to build them has become unsafe and means they could collapse.

The announcement was made just as the new school year began and it's caused havoc for many parents and teachers – and ignited a debate about what the government knew, and when.