Box Resources

DNA Extraction

Owl Pellets

Lemon Battery
March 2016

Aviation and Aerodynamics

Wearable Tech

Lemon Battery

Explore the natural potential in lemons by making a lemon battery with us this month! We are happy to be partnering with Green Works Natural Cleaners this month and getting girls to explore their own natural potential in STEM fields.

Experiment Instructional Videos

Research Lemon Batteries On The Web!

  • Green Works Natural Cleaners

    Green Works is teaming up with StemBox: a subscription service that provides girls with new and rewarding at-home experiments to try each month. Made to inspire and intrigue, the experiments open up a new world for girls in the areas of science, technology, engineering and mathematics.
    + Learn More

    Crash Course

    John Green leads YouTube viewers through fun and unique lessons on all things DNA! Great for other science topics too.
    + open link

    Khan Academy

    Khan Academy is a free online learning resource that uses videos to teach about all topics imaginable. Learn your way through DNA basics, replication, Mendelian genetics, and more. ( Psst! This site got Kina through a lot of Organic Chemistry in college!)
    + open link

  • DNA Game

    Match the base pairs of a replicating DNA strand on the Nobel Prize website. See how many you can match while the DNA replicates. But be careful, too many mistakes could lead to mutations beyond repair!
    + open link

    Crash Course

    John Green leads YouTube viewers through fun and unique lessons on all things DNA! Great for other science topics too.
    + open link

    Khan Academy

    Khan Academy is a free online learning resource that uses videos to teach about all topics imaginable. Learn your way through DNA basics, replication, Mendelian genetics, and more. ( Psst! This site got Kina through a lot of Organic Chemistry in college!)
    + open link

  • DNA Game

    Match the base pairs of a replicating DNA strand on the Nobel Prize website. See how many you can match while the DNA replicates. But be careful, too many mistakes could lead to mutations beyond repair!
    + open link

    Crash Course

    John Green leads YouTube viewers through fun and unique lessons on all things DNA! Great for other science topics too.
    + open link

    Khan Academy

    Khan Academy is a free online learning resource that uses videos to teach about all topics imaginable. Learn your way through DNA basics, replication, Mendelian genetics, and more. ( Psst! This site got Kina through a lot of Organic Chemistry in college!)
    + open link

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Troubleshooting the
Lemon Box

In some cases, the LED on your battery doesn't light up once you've connected the final wires! The first possible solution may be that the LED is attached backwards. If you'll notice, one of the LED wires is longer than the other. That's because one end is positive and the other is negative. Try re-attaching the wires to your LED, but the opposite way this time!

If flipping the LED around doesn't work it may mean there is a bad wire in your bunch. :( We at StemBox are very sorry about this but we consider it a second experiment! (Lucky you!) If you suspect a bad wire it's time to do an elimination test. Because our lemon battery really only requires three lemons you can limit the number of wires you need to test by moving to 3 lemons and swapping out different wires. Eventually you will find the one wire that does not work and you can toss it! But if you would prefer not to do this experiment send us an email and we can get you some new cords asap!

If your battery's been running full steam ahead for several days and you notice that it's stopped working, that's okay! This is a natural process in a chemical battery (hence the reason batteries day and there now exist rechargeable batteries! The acid in our lemon is corroding the the zinc and copper because of the passing of electrons back and forth, so you may notice that they start to lose their sheen or turn black. Totally normal! It may be time to find some new supplies (and less moldy lemons!).

Do you live in a part of the country where coming by lemons is more difficult or expensive? No worries! We're working with the property of acids and bases to make this experiment work. The pH of lemons is as low as 2.2 but you can check this list for other fruits with a similar pH to make this experiment work!
+ Click here for the list!

Email us: [email protected]! We will do our best to answer your other questions and supply you with any replacement pieces you need! :D