- The Skagit Bay Estuary Unit is comprised of estuary and intertidal area. This unit is primarily accessible by boat; there is some local area walk-in access during low tides. There are six locations offering access to this unit: WDFW Skagit Headquarters Unit (has a boat ramp); Big Ditch and Davis Slough (hand-launch boat access); Jensen; Milltown; and North Fork. Tides and river levels may restrict access. Recreation opportunities on the unit include waterfowl hunting, fishing, wildlife observation, hiking, boating and kayaking. The Skagit estuary contains critical habitats for waterfowl, shorebirds, fish and other aquatic species.
The calculus was the first achievement of modern mathematics and it is difficult to overestimate its importance. I think it defines more unequivocally than anything else the inception of modern mathematics, and the system of mathematical analysis, which is its logical development, still constitutes the greatest technical advance in exact thinking.
John von Neumann, in James R. Newman The World of Mathematics