Update about.md

Author: mary-python

_pages/about.md

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-As of February 2025, I have defended my PhD thesis and am on track to receive my doctorate in July 2025.
+As of April 2025, I have submitted the final version of my PhD thesis and am on track to receive my doctorate in July 2025.
 
 I am now working as a Data Scientist in the [Infectious Diseases Data Observatory (IDDO)](https://www.iddo.org/), based at the Centre for Tropical Medicine and Global Health in Oxford.
 
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 News
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+* April 2025: Submitted final version of PhD thesis.
+* March 2025: Submitted minor corrections for PhD thesis; accepted by examiners in the same month.
 * February 2025: Defended PhD thesis titled "Differentially Private Methods for Releasing Aggregated Multi-Dimensional Messages".
 * January 2025: Started postdoctoral role as Data Scientist at [IDDO, Oxford](https://www.iddo.org/).
 * November 2024: Submitted PhD thesis titled "Differentially Private Methods for Releasing Aggregated Multi-Dimensional Messages".