Everyone needs to know

During my life I got asked for a lot of things and I stumble about a lot of things myself.
Here is a completely unfinished list of things, which IMHO everyone should know.

If you can't explain it to someone, you haven't understand it.
But it is no shame to look it up before.

I recognized, I made it in English => probably I will translate it someday.

Knowledge for really everyone

Basic Math

Calculation

• Cross-multiplication (Dreisatz)
  Ho much cost one, if x cost y

Percentages:

• Basic calculations
  x% more
  y% of ...
• Percentage points vs. x%

Geometrie:

• Handle orthogonal triangles: a² + b² = c²
• Surface calculations
• Volume calculations

Statistics

• A minimal feeling for probability

Basic Computer Skills

Search, (Replace)

• STRG+F
• STRG+H, STRG+R (not always, but often it works somehow)

Windows:

• Move windows: Windows + Arrow
• Use multiple Desktops.
  Switch with: Windows + Tab or STRG + Windows + Left/Right

Usefull Apps

Mit der Nora-App kann man vom Handy aus ohne telefonieren zu müssen einen Notruf absetzen (z.B. aus dem Bus, wenn man etwas beobachtet, aber Angst hat einzugreifen).

Knowledge for every scientist

Advanced Math

Logarithmic Scales / Exponential growth

Error analysis (Fehlerrechnung)

• Calculate influence of uncertainty in x for f(x)