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The volume occupied by the ball typically 24 mm in diameter displaces tow material, creating a zone of lower fibre density around it

I disagree with this last statement

Transport Canada has specific rules around lithium batteries, which affect how many vape devices you can bring: Devices with batteries up to 100Wh (which covers virtually all consumer vape devices) can be carried on board There is no specific limit on the number of small lithium battery devices, but security officers have discretion Spare batteries (not inside a device) must also be in carry-on and should be individually protected to prevent short-circuiting For most vapers, bringing 23 disposables or a pod device with a couple of replacement pods is completely fine

J Hydrol 519:34663474 Green DS, Boots B, Carvalho JDS, Starkey T (2019) Cigarette butts have adverse effects on initial growth of perennial ryegrass (gramineae: Lolium perenne L.) and white clover (leguminosae: Trifolium repens L)