Brook, Brian, and investor Marc Portney test out motorized roller skates users can strap to their shoes, a water filter that works like a French press, a 360-degree infrared surveillance device, and a gun that lets people shoot flies with table salt.

Experts Brook and Brian help Marc decide if he should invest in a brain-controlled toy helicopter; a non-toxic, liquid stain repellant; a fetch toy that dogs can control by themselves; or an airbag vest for motorcyclists.