Crossing the border on foot, where the answer changes

This is the day she leaves the United States on foot. Peace Arch is a working land border crossing, not a gap in a fence. U.S. Customs and Border Protection names Blaine Peace Arch among the four land border pedestrian ports of entry in Washington state where it has extended Mobile Passport Control. Walking through it means being processed by Canadian officers on arrival, so she carries a passport. The Canada Border Services Agency recommends travelling with a valid passport, and an American arriving with a valid U.S. passport needs no Canadian passport, visa or eTA. Even inside Peace Arch Park itself, BC Parks warns that visitors may be asked for identification and immigration information by officers of either country.

North of the line the route runs about eight and a half miles into South Surrey and ends at Elgin, on the Nicomekl River. The river is tidal, and sternwheelers once travelled up it to collect produce from the farms along its banks. What survives is the Historic Stewart Farm at 13723 Crescent Road, inside Elgin Heritage Park. John Stewart came to the area in 1880 and the farmhouse was built in 1894; the Canadian Register of Historic Places calls it the only intact farm complex from the late nineteenth century remaining in Surrey, and notes that its position on the banks of the Nicomekl demonstrates the importance of water transportation to the development of the area.

A border day belongs in this walk because matching does not respect one. HLA markers are inherited, and a patient's best chance of an unrelated match is usually someone of similar ancestry, which is a fact about families rather than about passports. So the registries are linked to each other. The World Marrow Donor Association connects donor registries and cord blood banks from more than 57 countries, and its Search & Match Service lists 44 million stem cell donors and more than 750,000 cord blood units. Jada's donor lived five thousand miles away, and his cells were carried across an ocean to reach her.

It is also the day the practical answer changes, so here it is plainly. In the United States the registry is NMDP, formerly Be The Match. In Canada outside Québec it is Canadian Blood Services, which runs the national stem cell registry and states directly that Québec residents must register with Héma-Québec instead. In Québec it is Héma-Québec. All three begin the same way: you register with them, and they mail you a swab kit for the inside of your cheek. Each publishes its own age and health requirements, and those requirements are theirs to set and theirs to change. The Jada Bascom Foundation does not run a registry, does not mail kits and does not decide who is eligible. It can only tell you which door is yours.