How long can you hold your breath?

Volume 16 | Gr. 4-8 | U27712
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how long can you hold your breath
Materials list
• Stopwatch (TB14784) or a clock with a second hand
• Tape measure (TB15105)
• Graph paper, pad of 50 sheets (9706099)
• Pencil (9728094 or 9727070)
• Notebook (TB26495)