The lead article on our Insight section cover Sunday will be the fifth installment in our year-long 125th anniversary series on The News Tribune’s corporate and journalistic values.

This time Executive Editor David Zeeck will tackle the topic of objectivity, noting how the concept has changed in the newspaper business over the years.

On the letters page, we’ll have an oped piece from Metro Parks Tacoma commissioners Ryan Mello and Victoria Woodards. They respond to recent complaints that Metro Parks has kept the public in the dark about some important issues.

We’ll also have a point-counterpoint on the merits of all-day kindergarten. The Washington Policy Center contends research doesn’t support wide use of all-day-K. Bethel School Superintendent Tom Seigel, whose district plans to expand all-day-K this fall, begs to differ.