What is the half-life discovered in 2003?
CREATE TABLE "list_of_hassium_isotopes" (
  "isotope" text,
  "half_life" text,
  "decay_mode" text,
  "discovery_year" text,
  "reaction" text
);
SELECT "half_life" FROM "list_of_hassium_isotopes" WHERE "discovery_year"='2003';