Across the European Union, there is broad agreement that the 15 member states need to co-operate in preparing for a chemical or biological attack, but little progress has been made.

ECONOMIST: The enemy within | The

While chemical and electrical engineers continue to improve them, progress comes slowly.

FORBES: Why Hydrogen Cars Could Still Be The Future

These few variables have been chosen as proof of concept that progress could be made later on with more chemical parameters.

UNESCO: NATURAL SCIENCES