Go old-school with Slinkies. Many kids have never laid eyes on a Slinky, so if you have stairs in your home, kids can whip them out for a tutorial and a race.
Emily Westbrooks is a freelance writer and blogger from Maine. Based in Dublin, she's married to an Irishman and an adoptive mom to Maya and Noah. She writes about travel, parenting, adoption and fostering for sites like Romper and Moxie & Mabel, as well as for her own blog, From China Village.