Technology Speed Track

Release notes/changes for 1.4/1.4.1

• fix to force close on mobile sites when double tap zoom cycle goes back to the “all the way out” setting
• double-tap/triple-tap anywhere on a page to zoom
• setting to change triple tap delay value in advanced settings (so the lower the setting, the more responsive double-taps are, but the quicker you have to get your triple-tap in!)
• setting to change double-tap behaviour, between the existing zoom cycle, and also now just a simple zoom out only setting (so if you want to just keep it simple, and have double-tap to zoom in, triple tap to zoom out,
  the latter will be the setting for you). How many zooms this will result in per cycle will depend on the page you’re viewing.
• change to double-tap zoom cycle behaviour - now zooms ALL the way out to give a true page overview, and also introduces an intermediate step between page overview and 1:1 zoom (this is a nice level for sites with
  big fonts, eg. aintitcool.com)
• click title bar (or top of screen) to bring down the address/search bar
• click top left of screen to go to home page. Click it a second time when on the home page to exit the browser completely (or double-click from elsewhere).

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There is a snail climbing a 20-meter high pole. In a day, it climbs up 5m, but at night, it slips down 4m. How long does it take him to climb to the top?

Answer to last puzzle: 10
Explanation: [Easy/Unsure approach] Write down from 1 to 10 and simulate the paint job to see the pattern. You will see the post 1, 4, 9 turn back to red. All posts with squared number will be red and there are 10 of them. [Better approach]  Each post will change color for each common divisor of its post’s number, i.e., post #8 has 4 divisors (1, 2, 4, 8 ) so it will be painted 4 times, post #9 has 3 divisors (1, 3, 9) so it will be painted 3 times. All squared numbers have odd numbers of divisor and there is only 10 squared numbers from 1 to 100.

Builderman has to built a fence to keep the enemies of of his base.

The fence has 100 black fence posts. Builderman goes through and paints each post red. Then he goes through again and paints every other post black. He goes through a third time and paints every third post. He paints the red posts black and the black posts red. He He does this a fourth time for every fourth post, then a fifth, then a sixth, until he has gone through 100 times total. He’s exhausted. How many posts are red?

Answer to last puzzle: 6
Explanation: Thinking of a filled 3-brick tall pyramid, we can build it by combining a hollow 3-brick tall one and one 1-brick tall one (2×2 brick). Then a filled 5-brick tall pyramid can be combined by a hollow 5-brick tall, a hollow 3-brick tall, and one 2×2 brick. Same idea and so on. To fill a 11-brick tall one, we can build it by combining a hollow 11-brick tall, 9-brick tall, … , 3-brick tall and 0ne 2×2 brick. So the total would be 6.

Builderman wants to build a strong pyramid, so he constructs a solid (completely filled) one. The rules are the same: using only 2×2 and 2×4 bricks, and must use 2×4 bricks when possible. How many 2×2 bricks must he use in a 11-brick tall pyramid?

Answer to last puzzle: 1
Explanation: Don’t be fool by the picture. Except the top level, every other level can be built by using 2×4 bricks.

Builderman is constructing a hollow pyramid out of 2×2 and 2×4 bricks.

Whenever he has the choice, Builderman opts to use a 2×4. How many 2×2s must Builderman use to create a pyramid that is 11 bricks tall?