Gregory Tobias/Chemical Heritage Foundation Collections  A Chemcraft set from the mid-1950s. More Photos »  Ask scientists of a certain age about their childhood memories, and odds are they’ll start yarning about the stink bombs and gunpowder they concocted with their chemistry sets. Dangerous? Yes, but fun.  “Admittedly, I have blown some things up in my time,” said William L. Whittaker, 64, a robotics professor at Carnegie Mellon University who unearthed his first chemistry set, an A. C. Gilbert, in a junkyard around age 8. By 16, he was dabbling in advanced explosives. “There’s no question that I burned some skin off my face,” he recalled.  Under today’s Christmas tree, girls and boys will unwrap science toys of a very different ilk: slime-making kits and perfume labs, vials of a fluff-making polymer called Insta-Snow, “no-chem” chemistry sets (chemical free!), plus a dazzling array of modern telescopes, microscopes and D.I.Y. volcanoes. Nothing in these gifts will set the curtains on fire.  “Basically, you have to be able to eat everything in the science kit,” said Jim Becker, president of SmartLab Toys, who recalled learning the names of chemicals from his childhood chemistry set, which contained substances that have long since been banned from toys.  Some scientists lament the passing of the trial-and-error days that inspired so many careers. “Science kits are a lot less open-ended these days,” said Kimberly Gerson, a science blogger who lives outside Toronto. “Everything is packaged. It’s either ‘yes’ or ‘no.’ If you don’t get the right result, you’ve done it wrong and you’re out of chemicals.”  Others, though, say the new crop of science toys — even with their cartoonish packaging and heavy emphasis on neon goo — actually represent progress. More entertaining, educational and accessible than earlier products, which relied heavily on a child’s inner motivation, these toys may actually help democratize the learning of science and introduce children to scientific methods and concepts at an earlier age.  “I grew up in the 1960s, and a lot of the chemistry sets were kind of boring,” said William Gurstelle, a science and technology writer. “You’d go through the book, and at the end of the experiment you’d get some light precipitate at the bottom of the beaker. Maybe at most it changes color or something.”  Mr. Gurstelle’s books, which include “Whoosh Boom Splat” and “Backyard Ballistics,” teach people how to make dangerous projectiles, like a potato cannon that uses hair spray as launching fluid. But he had high praise for commercial science kits, which show children (among other things) how to make slime.  William L. Whittaker at the Planetary Robotics Lab at Carnegie Mellon University surrounded by the robots he has created.  “Well, that’s a pretty cool thing to have when you’re done,” Mr. Gurstelle said. “You’re not going to really learn to be a chemist from a chemistry set when you’re in seventh grade; you’re just going to be inspired. The point is that new chemistry sets and new toys are just better, because the manufacturers have figured out how to make them more fun.”  Some toy makers, like SmartLab, Mr. Becker’s company, have used this philosophy to give classic toys a makeover. One of SmartLab’s takes on a chemistry set, for instance, is the Extreme Secret Formula Lab, which comes with “squishy-lidded bubble test tubes” and “an abundance of glow-in-the-dark powder.” The game of Mousetrap has been re-envisioned as the Weird and Wacky Contraption Lab, meant to bring out children’s Rube Goldberg talents. And the slot car tracks that Mr. Becker recalls snapping together in his youth have been translated into a robot called ReCon 6.0, which children can program to roam around.  Jim Becker of SmartLab Toys.  “What we do is give kids the opportunity to learn through problem solving,” Mr. Becker said.  Of course, technology has also remade the experience of learning science. Children may be more likely to click on a science app than to go play outside.
Todayâs science kits lack the free-play style and sometimes dangerous materials of yore, but many argue that they can still spark a lifelong interest in inquiry.