By calculation (generator: ["now@trueknowledge.com"]) I know that:

The current time is April 21st 2014, 00:43:20

By calculation (generator: ["second_parameter@trueknowledge.com"]) I know that:

kilogram
is the second parameter of
91 kilograms

I know from locally stored knowledge that:

Fact 1:
1
is the multiplier that converts
kilogram and kilogram
([fact: ["641974384@trueknowledge.com"]])

Fact 1
is true for
October 5th 2009, 11:29:28 onwards
([fact: ["641974404@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:

Fact 1
is true at
April 21st 2014, 00:43:20

By calculation (generator: ["first_parameter@trueknowledge.com"]) I know that:

91
is the first parameter of
91 kilograms

By calculation (generator: ["product@trueknowledge.com"]) I know that:

91
is the product of
1 and 91

By calculation (generator: ["class_parametered_object@trueknowledge.com"]) I know that:

mass
is the class of the parametered object
91 kilograms

By calculation (generator: ["parametered_object_corresponding_to@trueknowledge.com"]) I know that:

91 kilograms
is the parametered object corresponding to
mass and 91 and kilogram

By calculation (generator: ["equivalent_to6@trueknowledge.com"]) I know that:

Fact 2:
91 kilograms
is equivalent to
91 kilograms

Fact 2
is true at
April 21st 2014, 00:43:20

Fact 2:
kilogram
is the unit used in
91 kilograms