Oddly Wired
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productivity

You are more likely to reach goals you write down by hand.

A 2014 study suggested that handwriting may promote deeper processing of information than typing, though subsequent attempts to replicate these findings have yielded inconsistent results.

The original Mueller and Oppenheimer (2014) study has been subject to replication failures, such as Urry et al. (2021), calling into question the reliability of the initial effect.

The physical friction of the pen makes your intentions stick.

Where this comes from

Study
Mueller and Oppenheimer, 2014, Psychological Science
What the check found
While the 2014 study did report these findings, it is a single, non-replicated study, and scientific consensus on the matter is currently mixed and inconsistent.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.