how to copy-paste history commands in R studio

1. go to History tab and find the command you want to copy
2. double-click it, it will show up in Console window
3. highlight and copy, then paste anywhere you want

[solved]Los Angeles Metro Bike Share return cannot be detected by the station --- no three beeping sounds

I returned the bike at the station and it was locked. But the machine couldn't detect it.

The solution:

Call 844-857-2453
and they will verify your information and update the trip record so that you won't be charged with extra money.

Apple macbook finder left toolbar disappeared

The problem has occurred occasionaly, usualy once per year for me. The fix:

1. Go to Finder
2. Click on the "Finder" on the top left of your screen
3. Preferences... -> Side Bar, then check the items you want to show on the left sidebar.

How to hide/not show the deletion/insertion marks on LibreOffice

1. Highlight the sentences that you want to remove the modification/insertion/deletion marks
2. Edit -> Track Changes -> Accept.

Now you only see the corrected version.

The specified file could not be written to. It may be in use

When you are trying to save your a pdf to a word file you may run into this error.
The solution is very simple:


Save in another folder!

How to type a newline/ line break when typing in a code box on blogger?

This applies to multiple platforms where an Enter means OK instead of linebreak


The solution:

Shift + Enter

How to make skeleton leaves magnolia

There are only a few types of leaves that can make good leaf skeletons. Here is a very nice one:

Magnolia Grandiflora Linn



1. Prepare NaOH solution, at lease 10%
2. Put leaves into the solution and use microwave to heat it at maximum, for 5 min (the solution should turn dark green)
3. Stir it for a while, take the leaves out of the solution, and use a toothbrush to remove the brown part of the leaves at the back. (now the leaves should become soft)
4. put the leaves back into the NaOH solution and boil another 5min, then stir
5. take out the leaves, use toothbrush again to remove leaf meats as much as you can, for both sides.
6. wash the leaves in clear water
7. put the leaves in detergent solutions for a couple minutes to let them become more transparent (they should turn yellow)
8. wash off the detergent and use paper towels to remove excess water
9. put the semi-dried leaves into layers of recycle papers or a bad magazine or book you don't like, put heave items on top of the whole pile and let them sit for at least one day to completely remove water and make them flat.
10. take out the leaves. They should be dry and flat now.

https://www.amazon.com/scuster-of-texas-skeleton-magnolia/dp/B00655RR3M

[solved]cannot create tasks on Google Calendar

Usually, click on the top region of the Google Calendar grids and you will be asked whether to create an event or task. But sometimes you don't get the option to create tasks.

Solution:

On the left part of Google Calendar, under "my calendars", make sure "tasks" are checked

How to change a single color to another on a picture ( replace red with green ) using lunapic online

1. go to https://www.lunapic.com/
2. upload your picture
3. Adjust -> Change color tint
4. pick the you color you want to use for replacement
5. click on the region that contains your original color you want to replace


But a better way is:
Adjust -> replace color

This type of file can harm your computer. Do you want to keep file.xml anyway? No save button

When downloading using Google Chrome you may receive this:

This type of file can harm your computer. Do you want to keep file.xml anyway?

You can click the save button to save. However, when there is not a save button, you should:

1. click "show all" button on the far right

2. click "keep"

What is N50

This explanation is much better than Wikipedia

http://www.molecularecologist.com/2017/03/whats-n50/

Vitamin C: naturally extracted or industrial synthetic

Synthesized through fermentation

https://www.precisionnutrition.com/all-about-vitamin-supplements

Examples of using linux cut command

https://www.poftut.com/linux-cut-command-examples/