OMG! Credit Card Antenna Geometry is so cool + some PIN Probability

The world  has mostly agreed on the size of a credit card:

Credit cards today contain a microchip and aerial.

A credit card is dissolved in ACETONE (solvent found in some nail polish removers) to extract the chip & aerial in this BBC video.

 

OMG! The cardless chip still works to pay for coffee. But if you wanted cash you would still need the PIN.

Square Root. It’s a Tree!

Just found this on Twitter! Had to share it.

NEXT:
If an IMAGINARY NUMBER screams alone in a forest can you imagine that you can hear it? Ha!

m+m maths 2: Guess, NO, calculate the number of m+ms in a jar!

Of course, mathspiggies, we can do the reverse maths and cheat … and use our superior maths skills to calculate the no. of m&ms in a cookie jar and then you WIN the cookie jar full of m&ms at the school fair.