sudo dd if=/dev/zero of=/tmp/output bs=8k count=10k; sudo rm -f /tmp/output

I hope they step on a LEGO. Repeatedly.

The problem with your one Project a day idea is that just about the time you get all 300 of your pc's setup it's time to stop getting new tasks and abort the existing ones so you can get new tasks from the next Project

#!/bin/bash

if ! [ $(id -u) = 0 ]; then
   echo "Must be run as root!"
   exit 1
fi

# Assume Bullseye...
VCGENCMD=/usr/bin/vcgencmd
if [ ! -f "$VCGENCMD" ];
then
  # Nope
  echo "Please upgrade me."
  VCGENCMD=/opt/vc/bin/vcgencmd
fi

if [ ! -f "/var/lib/boinc-client/global_prefs_override.xml" ];
then
  # Create overrides file

  echo "Creating computing preferences override of percentage of BOINC CPUs."
  echo -e "<global_preferences>\n   <max_ncpus_pct>50.000000</max_ncpus_pct>\n</global_preferences>" > /var/lib/boinc-client/global_prefs_override.xml
  chown boinc:boinc /var/lib/boinc-client/global_prefs_override.xml
fi

# Set variables to initial values

pcpus=$(grep -oPm1 "(?<=<max_ncpus_pct>)[^<]+" /var/lib/boinc-client/global_prefs_override.xml)
pcpus_new=$pcpus
pcpus_int=$(echo $pcpus | sed 's/\..*$//')
pcpus_trailer=$(echo $pcpus | sed 's/^[^.]*//')
source <($VCGENCMD measure_temp | sed "s/'C//g")

echo "Current temperature is: "$temp" °C"

# Change the number of cpus?

if awk "BEGIN {exit !($temp < 65)}";
then
  if awk "BEGIN {exit !($pcpus <= 75)}";
  then
    pcpus_new=$(expr $pcpus_int + 25)$pcpus_trailer
  else
    pcpus_new=100.000000
  fi
elif awk "BEGIN {exit !($temp > 75)}";
then
  if awk "BEGIN {exit !($pcpus > 25)}";
  then
    pcpus_new=$(expr $pcpus_int - 25)$pcpus_trailer
  else
    echo "Warning: overtemperature and unable to reduce BOINC load."
    pcpus_new=25.000000
  fi
fi

if awk "BEGIN {exit !($pcpus != $pcpus_new)}";
then
  echo "Switching percentage of BOINC CPUs from "$pcpus" to "$pcpus_new
  sed -i "s/<max_ncpus_pct>$pcpus<\/max_ncpus_pct>/<max_ncpus_pct>$pcpus_new<\/max_ncpus_pct>/g" /var/lib/boinc-client/global_prefs_override.xml
  boinccmd --read_global_prefs_override
fi