Greying Japan has a new weapon to scare people into saving for their retirement -- an exploding piggy bank.

The "Savings Bomb," which goes on sale in Japan next week, "explodes" and scatters coins if users fail to save for a long time, toy manufacturer TOMY Co Ltd said Thursday.

The battery-powered toy -- designed as a cartoon-style, ball-shaped black bomb with a skull and crossbones logo -- lights up, makes a noise, shakes violently and scatters coins if it is not topped up for a long time.

"Users must pick up and collect the scattered coins and reflect on their laziness," the Japanese company said.

Explain the U.S. banking system, in general terms, between 1790 and the Civil War. What are the three parts? How did dual banking emerge from this era? Why were state-chartered private banks more likely to fail than the free banks?

How did this system change (i) during the Civil War, and (ii) after the Civil War?

Define Glass Steagal. Why were banks blamed for the Depression? How does more recent research question that view?

When did deposit insurance start, and what was the initial amount insured?

What are holding companies, and why were they allowed in 1956?