Wednesday, February 18, 2015

Indoor Field Trip


Taking a break from "Wordless Wednesday" for a week because of this little guy. What is it? And what was he doing hiding in the insect field guide?

See those long pincers on the front of its body? They look just like the pincers on a scorpion, don't they. But this guy isn't a scorpion - it has no stinger. It's a "pseudoscorpion", also known as a "false scorpion" or "book scorpion".  It is related to scorpions, mites, ticks and spiders. Pseudoscorpions are very small, measuring less than 5 mm long - like this one that is sitting on a piece of lined notebook paper.

In the wild, pseudoscorpions live under leaf litter and mulch, in moss, under stones, and beneath tree bark. But in the winter they can find their way indoors and into a cozy home on a bookshelf. They don't have a stinger, and won't hurt people. But they are very dangerous to the small insects and mites they hunt in your house.

If you're still snowed in, go on an indoor field trip around your house this week. Windowsills are a great place to check for ladybugs, flies, and moths - most of them will probably be dried out. Check your books, too. You might find a pseudoscorpion waving his tiny pincers!




Friday, February 13, 2015

Nikola Tesla ~ Electrical Wizard

Electrical Wizard: How Nikola Tesla Lit up the World
by Elizabeth Rusch; illus by Oliver Dominguez
40 pages; ages 7-10
Candlewick Press, 2013

"The night of Nikola Tesla's birth, lightening zapped, crackled, and flashed overhead." A pretty fitting beginning for the life of a kid who wanted to harness the power of Niagara Falls and turn it to electricity.

As a young man, when electricity was generated by direct current, Tesla wanted to figure out how to use alternating current to run motors. When he figured out how, he traveled to America to meet with Edison.

"Nonsense," said Edison. People liked their direct current; why change something that's not broken? So Tesla set out to show that alternating current would work, and that it was safe. At the height of the "current war" between Tesla and Edison was the Chicago Worlds Fair - and it was to be powered by electricity. Tesla's alternating current. But Tesla had even more tricks up his sleeve: developing the turbines and generators that would convert Niagara Falls into electricity to light the homes and streets of Buffalo.


Tesla was a man full of ideas: could tides be harnessed to produce electricity? What about the spinning of the planets? Back matter includes further information about the rivalry between Tesla and Edison, explanations about DC and AC current, and how a spinning crank makes electricity.

Today is STEM Friday - head over to the STEM Friday blog to see what other bloggers are reviewing.   Review copy provided by publisher.