When you perform certain gestures with your hand--such as touching your thumb to your index finger in the "okay" sign--there are electrical signals associated with that gesture that pass through the nerves in your upper arm as they carry commands from your brain to your hand.

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"We think it sets a dangerous precedent for the government to usurp the role of fiduciaries by placing its thumb on the scale for one kind of investment--index funds, " the groups continue.

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The newer, thinner Kindle seems more interested in wowing customers with its iPod-like exterior than in comfortably filling the space between an index finger and a thumb.

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