Selecting a random sample from a set is simple. But what about selecting a fair random sample from a set of unknown or indeterminate size? That’s where reservoir sampling comes in, and [Sam ...

Learn how to use Excel’s XLOOKUP function to simplify data retrieval, save time, and master spreadsheets with this quick ...

In two-dimensional XLOOKUP formulas, it doesn't matter which way around the XLOOKUPs go. In this example, the ID lookup is first in the formula, and the column header lookup is nested. If these were ...

LCGC International interviewed Bob Pirok from the University of Amsterdam, Netherlands to discuss strategies for enhancing ...

Agilent J&W Scientific GC columns offer the highest quality and performance of any GC columns on the market today. From the lowest bleed levels and the best inertness for acid, base, and mixed ...

In addition to agitated columns, it includes mixer-settlers and packed columns. Design The agitated Kühni column has a simple and robust design.

It is reputed to make you happy. Just thinking about how good it is for you should make you happy to savor it. It is 11:38 a.m. and writing this column has created a strong desire in me for lunch. I’m ...

The Pirates capped a dominant homestand at PNC Park with a 5-0 win over the Cardinals on Wednesday afternoon. Now winners of six straight, the Pirates didn’t allow a run in their three games with the ...

Arthur C. Brooks is a contributing writer at The Atlantic and the host of the How to Build a Happy Life podcast. To receive his weekly column “How to Build a Life” in your inbox, sign up here.

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