No cost extension was granted through 12/31/24 due to several issues: 1) funds were not available for expenditures until late May, 2023. 2) The student intern could not immediately find local summer housing, delaying his starting work in the lab until late June. 3) Many of the electrical supplies needed were on backorder and/or were delayed in arriving, possibly due to continuing Covid shortages. 4) The PI had health issues from mid-May to mid-November, necessitating considerable sick leave. This unfairly delayed the student intern in his work since the PI was not available for guidance on a full-time basis.