How does the moon effect the Ocean? What is the drilling method known as "fracking" and why is it controversial? When were X-rays first commonly used?Find out the answers to all of the above with our "STEM" Top Trumps series.Entertaining educational card game loved by many, this range of Top Trumps has been designed spcifically to introduce younger players to the wonders of STEM and how they apply to the real world.Play Top Trumps anytime, anywhere, with 2-6 people.Get 4 great Top Trumps packs in our STEM bundle featuring all four STEM Top Trumps decks in one set!Easy-to-carry plastic cases means there are no limits on gameplay.Prepare to outsmart your opponents, discover new and exciting facts and duel your way to becoming the "Top Trump". Recommended Ages: 6 Years And Up Measurements: 7 Length/Inches Base Material: 100% Plastic Care: Wipe Clean Country of Origin: Imported p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} WARNING: CHOKING HAZARD – small parts. Not for children under 3 years.