The six arrows represent the first six terms of the Fourier series of a square wave. The two circles at the bottom represent the exact square wave (blue) and its Fourier-series approximation (purple).(Source: Wikipedia Commons)

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  • My new toothbrush supports BlueTooth ...

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A rail is shown. On the rail, Hitler, Mussolini, Stalin, Kim Il-Sung and Josef Fritzl are standing. Left of them is an overbridge, on top of the overbridge, Ghandi is standing. Further left, a train is coming. Subtitle: "Fortunately Gandhi was underweight."

Car transports wood truss on side mirror and opened petrol cap.(Source: hugelol.com)

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Panel 1: Two persons standing around. Something flies towards the left person. -- Panel 2: The left person bends over in pain, holds his hand in front of his eye, and sais "Ouch. Something flew into my eye." The right person approaches and sais "Let me see..." -- Panel 3: A near view of the left person's face is shown, the right person lifts the eyelids with this hand. A vertex is shown in the eye. The right person sais "Hmmm... It is a black hole..." -- Panel 4-7: The persons are sucked into the black hole. -- Panel 8-11: Earth is sucked in, too.

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Panel 1: People wearing earphones are sitting around. A person without earphones thinks: "Everybody's wired..." -- Panel 2: He suddenly sees a girl without earphones. -- Panel 3: He sais "at least one, at least you respond to your environment...", but she does not respond. -- Panel 4: The person next to her sais "She's deaf!"

Not so much this time ... have a lot of work to do ...

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Notice: This comic is without text. Panel 1: A blind person with a cane, and a sighted person with a helmet and a bike, shaking hands good-bye. -- Panel 2: The blind person looks sad. The sighted person lifts his finger and explains something. -- Panel 3: The blind person looks relieved and lifts his cane, the lower end of the cane flashes. -- Panel 4: The blind person happily sits on the cane which has a rocket flame in its back, and flies away. The sighted person waves his hand.

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Two people are walking towards each other, bending forward, having sad faces. As they meet, their faces suddenly smile at each other. As they keep on walking apart again, their faces are going back to sadness immediately.