nal-link">UCI Machine
Learning Repository</a> — that allow you to address interesting
questions when exploring FFTs:</p>
<ul>
<li>
<code>blood</code> – Which people donate blood? <a href="https://archive.ics.uci.edu/ml/datasets/Blood+Transfusion+Service+Center" class="external-link">source</a>
</li>
<li>
<code>breastcancer</code> – Which patients suffer from breast
cancer? <a href="https://archive.ics.uci.edu/ml/datasets/Breast+Cancer+Wisconsin+(Diagnostic)" class="external-link">source</a>
</li>
<li