Meet Henry and Jack Grover, the Riverside twins whose wildfire-inspired hydrogel kept hot material from reigniting nine times longer than water

• Henry and Jack GroverRiversideunified.orgWhen Henry and Jack Grover nearly lost their Riverside, California, home to a wildfire, the experience changed the way they thought about fire safety.
• The identical twins wanted to understand why areas that appear extinguished can still contain hot, smouldering material capable of reigniting days later.
• Their answer was a sprayable hydrogel designed to hold water against hot surfaces for longer than water alone.