
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Nanometer (nm) is a very small unit of length, where $1$ nm $= 0.000000001$ m. Placing an object of $1$ nm$^{3}$ on a ping-pong ball is like placing a ping-pong ball on the Earth. For example, a human hair with a thickness of $60,000$ nm. Nanotechnology has been increasingly valued by the scientific and industrial communities. Research shows that since the 21st century, $89\%$ of the $960$ most significant research directions globally are related to nanotechnology. To seize the strategic high ground in the field of nanotechnology, countries around the world spare no effort in developing nanotechnology. The Chinese Academy of Sciences Institute of Physics has developed the world's thinnest carbon nanotube, with a diameter of only $0.5$ nm, which is equal to $0.0000000005$ m. Expressing the number $0.0000000005$ in scientific notation is ______.

Present the answer in LaTex format: \boxed{Your answer}
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