What is a Pulsar by Cihan News Agency (CNA). An international team of astronomers has used X-ray telescopes in space and ground-based telescopes, including two of CSIRO's, to identify a. that switches between emitting X-rays and emitting radio waves.
The Panasonic Toughbook CF-53 is a beefy laptop with a rugged design that goes from the street to the office and out to the field without breaking a sweat.
Knowing Excel and by that you say you use the workbook for a while now, the source of the issue is possibly that the file is full of garbage (Excel is not really good in cleaning up reverted actions or removing cell-reference if you delete data from it with the DEL key).