What is a tornado? -- What causes tornadoes? -- Where and when do tornadoes happen -- Case study: tri-state twisters, 1925 -- What happens in a tornado? -- Case study: Bangladesh, 1996 -- Who helps after a tornado? -- Case study: Oklahoma and Kansas, 1999 -- Can tornadoes be predicted? -- Can people prepare for tornadoes? -- Can tornadoes be prevented? -- Terrifying tornadoes of the recent past.