All right, this is a video on the difference between the three modes in your calculator: normal, scientific, and engineering. The main difference lies in the notation of the solutions they provide. In the normal mode, if I have a number like 12.456789 and I hit enter, it will display exactly that: 12.456789. However, if I switch to scientific mode, the calculator will present the result in scientific notation. After switching modes and hitting enter on the same number, it will be displayed as 1.2456789 times ten to the power of one. The "e" in the notation simply denotes "times ten," and the number after it represents the exponent. On the other hand, if I choose the engineering mode, the calculator will display two digits to the left of the decimal point. For example, if I have a number like 12.4 and hit enter, it will show as 12.4. This tells us that it can be written as 1.24 times ten to the power of zero. In engineering notation, the "ten to the zero" simply means that there is no need for a multiplication by ten, as any number raised to the power of zero equals one. In cases where we have larger numbers like 124,567, hitting enter will result in the calculator displaying it as 123 times ten to the power of three. This demonstrates the difference between the normal notation, scientific notation, and engineering notation.