What Are Some Examples of Tiny Mistakes That Eventually Led to Major Catastrophes?

Recently I saw this :The above answered by someone create confusion. What He/She wants?To avoid such cases, may be below one is better solution:

1. 2 led on latching pushbutton NO arduino

Another possibility if you just want to use a cheap SPST tact switch: simulate this circuit - Schematic created using CircuitLabThis will work because the 74LVC1G74 has a Schmitt trigger clock input, which allows a simple RC to be used to debounce the switch. If power is applied with a reasonably fast rise time, the circuit will power up with the Q output low (D1 on) and /Q high (D2 off). That can be reversed by tying the D input to 5 rather than 0V.

2. Trigger led with both Arduino and tactile button

Yes. There is a much better solution. First off you need a resistor in series with your LED. Connect the resistor from the 5V and then to anode of the LED. The switch would connect from the cathode of the LED to GND. When pressed the LED will go on. Connect the output to the cathode of the LED. Under no circumstances should your software ever set the output pin to a '1' high level. You want to avoid the situation where a high output level can get shorted to GND by pressing the switch. To turn the LED on the pin is set low '0' as an output. To turn off the LED the pin is set to input mode.

3. Should a ship be led by the captain or crew?

The captain of course. A ship is not some democratic parliamentary hall. The captain is trained and educated to lead the ship,the crew follow!

4. What led to the collapse of the Roman Empire?

possibly the biggest reason for the downfall was that the romans stretched their empire too thin. the mongols from asia were constantly invading the now europe. this caused the germans to flee into roman territory. therefore, rome had to fight numerous battles

5. what race has historically led the way in these areas?

Which came first: The tree or the treehugger?

6. In China do they make products out of real led?

The people of China are some of the best people you could ever want to meet. With that said the government of China could care less about the people. The government is after the fast dollar and does not care about the damages this chase causes. They have covered up the health issues when the baby milk had been tainted to the point of causing many health problems to their own children. Even just recently information has come out of another cover up of the same tainted milk being given to their children. This had been a extended cover up that the government did not want to be found. There has also been a lot of information come out of China about plants that were close to towns and were dumping heavy metals into the ground as a cheap way to dispose of this health hazard. The problem was that a lot of children lived in the same are of these plants. The government again tried to cover this up and to stop the parents of these children from having any access to voice their concerns about their children. Only when doctors tested these children and found high levels of lead and other heavy metals in these children bodies did anything began to happen. When these items come up the government tries to cover this up so it is not known. With this attitude towards their children when it is obvious there is a problem, what is out there that the government keeps from view and how much of these actions are going on every day.

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