diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad22c8c..b2599b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,14 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [UNRELEASED]
+## [0.20.6]
+### Fixed
+* Agents now return `time.INFINITY` when dead, instead of 'inf'
+* `soil.__init__` does not re-export built-in time (change in `soil.simulation`. It used to create subtle import conflicts when importing soil.time.
+* Parallel simulations were broken because lambdas cannot be pickled properly, which is needed for multiprocessing.
+### Changed
+* Some internal simulation methods do not accept `*args` anymore, to avoid ambiguity and bugs.
 ## [0.20.5]
 ### Changed
 * Defaults are now set in the agent __init__, not in the environment. This decouples both classes a bit more, and it is more intuitive 
diff --git a/soil/agents/__init__.py b/soil/agents/__init__.py
index c9bcd23..c4e1023 100644
--- a/soil/agents/__init__.py
+++ b/soil/agents/__init__.py
@@ -145,6 +145,7 @@ class BaseAgent(Agent):
         self.alive = False
         if remove:
             self.remove_node(self.id)
+        return time.INFINITY
 
     def step(self):
         if not self.alive:
@@ -313,18 +314,16 @@ class FSM(NetworkAgent, metaclass=MetaFSM):
 
     def step(self):
         self.debug(f'Agent {self.unique_id} @ state {self.state_id}')
-        try:
-            interval = super().step()
-        except DeadAgent:
-            return time.When('inf')
+        interval = super().step()
         if 'id' not in self.state:
-            # if 'id' in self.state:
-            #     self.set_state(self.state['id'])
             if self.default_state:
                 self.set_state(self.default_state.id)
             else:
                 raise Exception('{} has no valid state id or default state'.format(self))
-        return self.states[self.state_id](self) or interval
+        interval = self.states[self.state_id](self) or interval
+        if not self.alive:
+            return time.NEVER
+        return interval
 
     def set_state(self, state):
         if hasattr(state, 'id'):
diff --git a/soil/simulation.py b/soil/simulation.py
index 427adb8..39d909d 100644
--- a/soil/simulation.py
+++ b/soil/simulation.py
@@ -1,11 +1,12 @@
 import os
-import time
 import importlib
 import sys
 import yaml
 import traceback
 import logging
 import networkx as nx
+
+from time import strftime
 from networkx.readwrite import json_graph
 from multiprocessing import Pool
 from functools import partial
@@ -98,7 +99,7 @@ class Simulation:
         self.network_params = network_params
         self.name = name or 'Unnamed'
         self.seed = str(seed or name)
-        self._id = '{}_{}'.format(self.name, time.strftime("%Y-%m-%d_%H.%M.%S"))
+        self._id = '{}_{}'.format(self.name, strftime("%Y-%m-%d_%H.%M.%S"))
         self.group = group or ''
         self.num_trials = num_trials
         self.max_time = max_time
@@ -142,10 +143,10 @@ class Simulation:
         '''Run the simulation and return the list of resulting environments'''
         return list(self.run_gen(*args, **kwargs))
 
-    def _run_sync_or_async(self, parallel=False, *args, **kwargs):
+    def _run_sync_or_async(self, parallel=False, **kwargs):
         if parallel and not os.environ.get('SENPY_DEBUG', None):
             p = Pool()
-            func = lambda x: self.run_trial_exceptions(trial_id=x, *args, **kwargs)
+            func = partial(self.run_trial_exceptions, **kwargs)
             for i in p.imap_unordered(func, range(self.num_trials)):
                 if isinstance(i, Exception):
                     logger.error('Trial failed:\n\t%s', i.message)
@@ -154,10 +155,9 @@ class Simulation:
         else:
             for i in range(self.num_trials):
                 yield self.run_trial(trial_id=i,
-                                     *args,
                                      **kwargs)
 
-    def run_gen(self, *args, parallel=False, dry_run=False,
+    def run_gen(self, parallel=False, dry_run=False,
                 exporters=[default, ], stats=[], outdir=None, exporter_params={},
                 stats_params={}, log_level=None,
                 **kwargs):
@@ -183,8 +183,7 @@ class Simulation:
 
             for exporter in exporters:
                 exporter.start()
-            for env in self._run_sync_or_async(*args,
-                                               parallel=parallel,
+            for env in self._run_sync_or_async(parallel=parallel,
                                                log_level=log_level,
                                                **kwargs):
 
diff --git a/soil/time.py b/soil/time.py
index 889c7c8..29ae31f 100644
--- a/soil/time.py
+++ b/soil/time.py
@@ -15,6 +15,8 @@ class When:
     def abs(self, time):
         return self._time
 
+NEVER = When(INFINITY)
+
 
 class Delta:
     def __init__(self, delta):
diff --git a/tests/test_agents.py b/tests/test_agents.py
new file mode 100644
index 0000000..76e0998
--- /dev/null
+++ b/tests/test_agents.py
@@ -0,0 +1,24 @@
+from unittest import TestCase
+import pytest
+
+from soil import agents, environment
+from soil import time as stime
+
+class Dead(agents.FSM):
+    @agents.default_state
+    @agents.state
+    def only(self):
+        self.die()
+
+class TestMain(TestCase):
+    def test_die_raises_exception(self):
+        d = Dead(unique_id=0, model=environment.Environment())
+        d.step()
+        with pytest.raises(agents.DeadAgent):
+            d.step()
+    def test_die_returns_infinity(self):
+        d = Dead(unique_id=0, model=environment.Environment())
+        assert d.step().abs(0) == stime.INFINITY
+
+
+