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2021


Twins and investing

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Imagine you and a twin each start investing $10,000 annually, but at different times. You contribute for 10 years and then stop, while your twin starts after you stop and contributes until retirement age. Who ends up with more money at age 65? How does the annual interest rate affect the outcome?

如何釋放iOS設備的存儲空間?

如何釋放iOS設備的存儲空間?

Google Photos可幫你備份手機上的相片。你可以在妥善備份後將相片從手機上移除,藉此釋出手機的儲存空間。

2020


How to limit kids access to one app on iPhone and iPad?

Follow the instructions below to lock iPhone and iPad to the current running app. Useful during kids’ FaceTime so that accidental touches do not interfere with the call. The feature also allows the parent to set a timer so the length of, for example, playing games, can be limited.

2019


2018


Force git user config for each repo

Now you can tell Git not to guess, but rather to insist that you set user.name and user.email explicitly before it will let you commit: